Document:

<PAGE>   1
                                                                   EXHIBIT 10.28

                            AVENIR(TM) PROPOSAL FOR
                                     HS.COM

G. SYSTEM / DATA LICENSE AGREEMENT

This is a Data License Agreement (Agreement) effective 9/30/98 (Effective Date)
between Healthdemographics, Inc. (a Delaware Corporation) (HD) with principal
offices at 4901 Morena Blvd., Suite 701, San Diego, CA 92117 and HS.com
(Company) with principal offices at 380 Vista Abierta, El Cajon, CA 92019.

Definitions:

a.    "AVENIR and HealthPacs" Data are HD proprietary products that include
      demographic data, population based models of the incidence of diseases by
      category, estimates of the demand for services (inpatient, outpatient,
      physician services, etc.). These models present estimates of the current
      demand and forecasts of the changes in demand that can be anticipated over
      the next five (5) years, as described in Health-demographics most recent
      documentation.

b.    For purposes of this Agreement, "Product" or "Products" shall be defined
      as (a) each Product designated in this Agreement, including but not
      limited to AVENIR and HealthPacs; and (b) any materials, know-how and
      technical information provided to Company in written form for use in
      connection with each Product.

Grant of License:

a.    AVENIR/HealthPacs; Subject to the terms and conditions of this Agreement,
      HD hereby grants to Company, a non-exclusive, non transferable license to
      use certain AVENIR/ HealthPacs databases specified in Exhibit A, attached
      hereto and incorporated herein, to create specialized reports to be sold
      in conjunction with Company's services to Company's customers. Company
      shall not resell in whole or in part the HealthPac databases. All other
      uses of the Product are strictly prohibited under the terms of this
      agreement.

b.    Company may not authorize third parties to use or market the Product, or
      any part thereof.

c.    All reports, maps and databases generated by the AVENIR System that
      contain Healthdemographics content shall reference Healthdemographics as
      the source of the data.
<PAGE>   2
                            AVENIR(TM) PROPOSAL FOR
                                     HS.COM

Access to the Product:

a.    Delivery: Upon execution of this Agreement, HD will deliver the Product to
      the Company in the format outlined in Exhibit A.

b.    Product Changes: HD reserves the right to make any changes, modifications
      or enhancements to the Product during the term of the Agreement as long as
      they do not diminish the quality of or substantially alter the content of
      said Product.

Term of License: The term of license granted hereunder shall commence upon the
Effective Date specified herein and continue for one (1) year.

Payment: Company agrees to pay HD an annual license fee for the AVENIR/HealthPac
data of $120,000. The first payment of $40,000 will be due Net 60 from product
delivery. The second payment of $40,000 will be due Net 150, and the third
payment of $40,000 will be due Net 180. Company is responsible for all
applicable use and sales taxes.

HD Support:

a.    HD agrees that during the term of this Agreement, HD will furnish all
      modifications, enhancements and corrections to the Product necessary to
      fulfill its obligations to Company under the Agreement.

b.    Company shall be entitled during the term of this Agreement to the
      following products and services from HD at no additional charge: (1) one
      copy of each appropriate user manual, (2) use of all Product
      modifications, improvements, and updates, and (3) toll free telephone
      support Monday through Friday, 8:00 a.m. to 5:00 p.m. Pacific Time,
      excluding legal holidays, for all authorized personnel within Company's
      organization.

Copying the Product: Other than a single copy for backup and archival purposes,
Company shall make no copies of the Product or any part thereof without the
express written consent of HD.

Limitation of Liability: HD shall not be responsible for any statement or
representation made in regard to the Product by an employee of Company.
<PAGE>   3
                            AVENIR(TM) PROPOSAL FOR
                                     HS.COM

OTHER THAN AS SPECIFICALLY SET FORTH IN THIS AGREEMENT, HD MAKES NO
REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, AS TO THE MERCHANTABILITY,
FITNESS FOR ANY PARTICULAR PURPOSE OR OTHERWISE WITH RESPECT TO THE PRODUCT, NOR
SHALL BE LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF HD
HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. In no event
shall HD's liability to Company, under this Agreement, if any exceed the amount
of payments made by Company to HD under this Agreement.

Ownership of Product: The Product shall at all times be and remain the sole and
exclusive property of HD. It is mutually agreed that this Agreement involves a
license for the use of the Product and that nothing contained herein shall be
deemed to convey any title or ownership in the Product to Company.

Termination: Either party may terminate this Agreement if (a) the other party
commits a breach of the Agreement, and (b) said breach has not been cured to the
reasonable satisfaction of the non-breaching party within thirty (30) days of
receipt of written notice from the non-breaching party stating the nature of
said breach, and delivered by registered or certified mail.

Indemnification by HD: HD represents and warrants that it has title or
proprietary rights to license the Product, and/or to sublicense any aspect of
the Product to which HD does not have title or proprietary rights. HD shall
defend, indemnify and hold Company harmless from any claim that any part of the
Product infringes an any third party, provided that HD is notified within 90
days by Company of such claim. HD shall have sole control of the defense with
respect to the claim (including settlement of such claim) unless HD agrees
otherwise.

Indemnification by Company: Company shall defend, indemnify and hold HD harmless
from and against any losses, damages, claims, demands, suits and liabilities
(including reasonable attorney's fees) that may directly or indirectly result
from Company's use of the Product.

Survival of Obligations: HD and Company's obligations under this Agreement which
by their nature would continue beyond the termination, cancellation or
expiration of this Agreement, including by way of illustration only and not
limitation, those in clause "Limitation of Liability" shall survive
termination, cancellation or expiration of this Agreement.
<PAGE>   4
                            AVENIR(TM) PROPOSAL FOR
                                     HS.COM

Notices: Any notice to be given under the Agreement shall be given in writing
delivered to the address of each party set forth, or to such other address as
either party may designate by written notice to the other.

Assignments: This Agreement may not be assigned by either party in whole or in
part, except to subsidiaries or affiliates, without prior written consent of the
other party. Any attempted assignment absent such consent shall be void.

General Provisions: Should any provision of this Agreement be held by a tribunal
of competent jurisdiction to be contrary to law, the remaining provisions shall
remain in full force and effect. This Agreement constitutes the entire
understanding between HD and Company and may not be altered except by a written
contract signed by authorized representatives of HD and Company. The terms and
conditions of this Agreement are offered and valid until September 30, 1998.
Please sign and return two copies of this agreement. This provides original,
signed copies to HS.com and Healthdemographics.

Accepted and Agreed:

Healthdemographics                       HS.com
4901 Morena Blvd.                        380 Vista Abierta
Suite 701                                El Cajon, CA  92019
San Diego, CA  92117

/s/ M.D. Chermak                         /s/ C.R. Smith
----------------------------             --------------------------------------
Michael D. Chermak                       Charles Smith, President
Chief Operating Officer                  Printed Name/Title

Date:  9/29/98                           Date:  9/29/98
<PAGE>   5
                            AVENIR(TM) PROPOSAL FOR
                                     HS.COM

                                    EXHIBIT A

                                PRODUCT LICENSES

A. AVENIR/HealthPac Database License

      The following HealthPacs are included for the entire United States, by Zip
Code, County, and State:

                              HealthPac Databases:

<TABLE>
<S>                          <C>   <C>   <C>
 1.   Ambulatory             [X]    9.   Managed Care (county level only)    [X]
 2.   Behavioral Medicine    [ ]   10.   Pediatrics                          [ ]
 3.   Cancer                 [ ]   11.   Provider Inventory                  [X]
 4.   Cardiovascular         [ ]   12.   Rehabilitation                      [ ]
 5.   Demographic            [X]   13.   Renal Care                          [X]
 6.   DRG                    [X]   14.   Respiratory                         [ ]
 7.   Eyecare                [ ]   15.   Senior                              [X]
 8.   Hispanic               [ ]   16.   Women's Care                        [X]
</TABLE>

Additional Data Included

Hospital MedPar and Nursing Home Cost Database

Mailing list databases for: Hospitals, Diagnostic Imaging Centers, Kidney
Dialysis Centers, Nursing Homes, Ambulatory Care Centers, Outpatient Surgery
Centers, and Medical Device, Supply, and Equipment Manufactures and
Distributors. These mailing lists will be geocoded, and will contain contact
names and phone numbers.

B. License Title and Product Return: HD shall retain all rights and title to the
licensed Products described herein. Upon expiration of this Agreement, Company
shall return to HD all licensed Products within five (5) business days.

Use and Transferability: The AVENIR/HealthPac Product database access is
licensed for twelve concurrent users. Company may physically transfer the
Product from one computer to another provided the Product is used on only twelve
computers at a time. Company may not distribute copies of the Avenir software
application to others.
<PAGE>   6
                            AVENIR(TM) PROPOSAL FOR
                                     HS.COM

                                   ADDENDUM TO
                          SYSTEM/DATA LICENSE AGREEMENT

This Addendum is attached to and made a part thereof of the System/Data License
Agreement (Agreement) between Healthdemographics (HD) and HS.com, Inc. (Company)
executed on September 29,1998 (date). This Addendum shall have the same binding
force and effect on all parties hereto as does the Agreement, and shall take
precedence over any and all conflicting or contrary language contained in the
Agreement or prior Addenda. HD and Company agree as follows:

In consideration of payment to Healthdemographics of the additional sum of
$250,000.00, Healthdemographics covenants and agrees that during the initial
term-year of this Agreement it shall not license (the product) to any other
party for use in the business of Internet-based sales or purchases of medical
supplies, devices or equipment; provided, however, that this covenant shall not
apply to other pre-existing current licensees of (the product) from
Healthdemographics whose license agreements do not contain such a restriction on
usage.

Payment is due Net 90 from the execution of this Addendum.

Agreed and Accepted.

Healthdemographics                       HS.com
4901 Morena Blvd.                        380 Vista Abierta
Suite 701                                El Cajon, CA  92019
San Diego, CA  92117

/s/ Michael Chermak                      /s/ Ben Carter, CFO
-------------------------------          ---------------------------------------
Michael D. Chermak, COO                  Signature & Title

Date: 12/24/98                           Date: 12/24/98<PAGE>   1

                                                                   EXHIBIT 10.29

                         SUPPLYLINE(R) LICENSE AGREEMENT

        This AGREEMENT (the "AGREEMENT") is executed as of this 13th day of
October, 1999, (the "EXECUTION DATE") with certain provisions as described
herein to be effective as of October 15, 1999 (the "EFFECTIVE DATE") by and
between OWEN HEALTHCARE, INC. ("OWEN"), a Texas Corporation with its principal
place of business located at 1330 Enclave Parkway, Houston, Texas 77077, and
MEDIBUY.COM, INC. ("CLIENT"), a Delaware Corporation with its principal place of
business located at 7777 Alvarado Road, La Mesa, California 91941.

                                    RECITALS

        WHEREAS, OWEN has created and is the sole owner of a supply database
product known as Supplyline(R), a tool for the management of healthcare supply
cost, utilization, and purchasing contract compliance,

        WHEREAS, Supplyline(R) is a database of information which is designed to
link supply manufacturer assigned Bar Code Numbers to OWEN designed
Supplyline(R) Product Classification Number (incorporating categories, product
lines, class codes, product codes manufacturer and/or distributor data) and
Supplyline(R) Product Classification Numbers to Supplyline(R) Reference Numbers
("SUPPLYLINE(R) SYSTEM"),

        WHEREAS, CLIENT is an Internet Infomediary organization supporting
healthcare providers, and wishes to use Supplyline information in its internal
business activities,

        WHEREAS, the parties desire to memorialize their agreements,

        NOW, THEREFORE, for and in consideration of the agreements contained
herein, the adequacy of which consideration is hereby acknowledged and
confessed, the parties hereby agree as follows:

        PROVIDED BY OWEN. OWEN will provide CLIENT with the following.

        OWEN agrees to provide CLIENT with the applicable license and data files
listed in EXHIBIT A. The license will allow the CLIENT access to all
Supplyline(R) listings, including invoice price data. The data fields included
for the license type selected by CLIENT are listed in EXHIBIT A. The data files
will be provided to client via CD ROM or other mutually agreed upon medium or
media and updated monthly. The initial delivery of data files shall be made
following receipt of the initial installment of the applicable License Fee. The
amount of the License fee(s) due from CLIENT to OWEN will be calculated using
EXHIBIT B. OWEN agrees the SUPPLYLINE(R) SYSTEM will

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be readable and useable by CLIENT. OWEN agrees to provide its standard level of
support to CLIENT for the implementation of the SUPPLYLINE(R) SYSTEM.

        PROVIDED BY CLIENT. CLIENT agrees to provide OWEN with the following.

        CLIENT agrees to provide OWEN with line item invoice data for all
purchases processed by CLIENT on a monthly basis. Invoice data must contain
distributor and or manufacturer, product description, catalog number, purchase
quantity, purchase unit of measure, quantity per unit of measure, price paid for
item, invoice date, and invoice number. OWEN agrees to use CLIENT supplied data
solely for the purpose of adding price information to the price comparison
portion of the database. No information supplied by CLIENT will be identifiable
as originating from CLIENT to any other licensee or will be used by OWEN for any
other purposes than adding price information to the price comparison portion of
the database.

        COMPENSATION. Client agrees to pay OWEN as described below.

        1.      Supplyline(R) Licensing Fee: Pursuant to EXHIBIT B, CLIENT shall
                pay to OWEN those License fees set forth in EXHIBIT B, payable
                as provided herein.

        2.      Payment: Initial payment is due within thirty (30) days of
                receipt by OWEN of this executed AGREEMENT. Any subsequent fees
                shall be due within thirty (30) days of the invoice date.

                Provided OWEN is not in default under this AGREEMENT, if full
                payment is not received by OWEN within thirty (30) days of the
                invoice date, CLIENT will be charged and agrees to pay, a
                finance charge on any unpaid balance equal to the lesser of one
                and one-half percent (1.5%) per month, or the maximum rate
                permitted by law, if lower.

        3.      CLIENT shall make all payments to OWEN under this AGREEMENT by
                either wire transfer of funds (FEDWIRE) to the appropriate OWEN
                bank account as provided by OWEN or, alternately, by mail, to
                the following address:

                      Owen Healthcare, Inc.
                      21377 Network Place
                      Chicago, Illinois 60673

        TERM OF LICENSE. The term of the license to the applicable Supplyline(R)
Data Files ("SUPPLYLINE(R) SYSTEM") shall be for one (1) year from the EFFECTIVE
DATE. The term of the license is subject to earlier termination for breach of
these license terms, as described below.

                                       2
<PAGE>   3

        LICENSE GRANT. In consideration of the payment provided by CLIENT, as
defined in this AGREEMENT, and for the term set forth above and subject to the
restrictions hereinafter set forth, OWEN hereby grants CLIENT a personal,
non-exclusive and non-transferable license to:

        (a)     use the SUPPLYLINE(R) SYSTEM within the CLIENT offices located
                at the address described in this AGREEMENT or such other
                locations approved in advance by OWEN, on one or more computers
                for internal purposes only and solely for the CLIENT's internal
                business activities, except as expressly provided in Paragraph 4
                under License Restrictions.

        (b)     use the SUPPLYLINE(R) SYSTEM in connection with other programs
                maintained for CLIENT's own internal use within CLIENT offices;
                provided that, to the extent that the SUPPLYLINE(R) SYSTEM is
                modified through or to the effect such use, the SUPPLYLINE(R)
                SYSTEM as so modified shall continue to be the property of OWEN
                and shall continue to be subject to the terms of this AGREEMENT;
                and provided further that, upon termination of the license
                granted in this AGREEMENT, SUPPLYLINE(R) SYSTEM as so modified
                shall be completely removed from such other programs.

        (c)     make one (1) copy of the SUPPLYLINE(R) SYSTEM for archival or
                backup purposes, provided such copy includes all OWEN's
                copyright or other proprietary notices.

        LICENSE RESTRICTIONS: The foregoing license shall be subject to the
following restrictions.

        1.      Except as provided above, CLIENT shall not modify the
                SUPPLYLINE(R) SYSTEM or any part thereof, or attempt to alter,
                decompile, cross compile, disassemble, reverse engineer, or use
                any other means to decode or make a derivative work from the
                SUPPLYLINE(R) SYSTEM. Under no circumstances may CLIENT use the
                SUPPLYLINE(R) SYSTEM or any parts thereof or any systems or
                codifications included therein to develop an alternate
                codification or classification system.

        2.      CLIENT shall not lend, lease, sublicense, or attempt to perfect
                any lien or property right in, the SUPPLYLINE(R) SYSTEM, or
                otherwise make the SUPPLYLINE(R) SYSTEM available to any third
                party or any Affiliate of CLIENT.

                                       3
<PAGE>   4

        3.      CLIENT agrees that the SUPPLYLINE(R) SYSTEM will be used under
                the license granted hereby only for the benefit of CLIENT. In
                the event CLIENT incorporates the SUPPLYLINE(R) SYSTEM into
                products or services offered to CLIENT'S customers, the
                SUPPLYLINE(R) SYSTEM shall not be visible to or downloadable by
                CLIENT'S customers. The CLIENT agrees that any installation of,
                or incorporation of SUPPLYLINE(R) information into other
                products or services offered by CLIENT, or access to the
                SUPPLYLINE(R) SYSTEM from CLIENT offices not stated as its
                principal place of business in this agreement will require a
                SUPPLYLINE(R) Site License fee pursuant to EXHIBIT B.

        4.      Under no circumstances may the codification system or generic
                descriptions that are included in the SUPPLYLINE(R) SYSTEM be
                transmitted or disclosed to any third party or Affiliate of
                CLIENT; provided, however, CLIENT may show the alpha numeric
                Product Description on screen, but it shall not be downloadable.

        5.      CLIENT may transmit and receive SUPPLYLINE(R) proprietary data
                fields only with those entities identified by OWEN as possessing
                the required Supplyline(R) License Agreement.

        6.      CLIENT agrees that throughout the term of this AGREEMENT and any
                extension thereof, it will not directly or indirectly throughout
                itself or any affiliate, develop, invest, contract, design,
                create, or acquire any rights in any system which might compete
                or replace the SUPPLYLINE(R) SYSTEM unless either party shall
                first have exercised its right to terminate and tendered written
                notice in accordance with the Term section of this AGREEMENT.
                OWEN agrees that the UNSPSC catalogue system for medical
                supplies and medical devices in its current form utilized by
                CLIENT shall not constitute a breach of this AGREEMENT by
                CLIENT.

        PROPRIETARY INTERESTS AND OWNERSHIP OF PROGRAM. The SUPPLYLINE(R) SYSTEM
is licensed to CLIENT by OWEN for CLIENT's use in accordance with this
AGREEMENT. The SUPPLYLINE(R) SYSTEM, any copies made by CLIENT and all
proprietary rights whatsoever thereto shall remain the sole and exclusive
property of OWEN. The SUPPLYLINE(R) SYSTEM and the proprietary systems and
information contained therein constitute trade secrets of OWEN, and the
unauthorized use or disclosure of the SUPPLYLINE(R) SYSTEM by CLIENT will result
in irreparable damage to OWEN.

        CONFIDENTIAL INFORMATION. The SUPPLYLINE(R) SYSTEM, any documentation
provided by OWEN for such program or its use, and any information furnished to
CLIENT by OWEN that is marked "confidential" or "proprietary" are the sole and
exclusive proprietary information or trade secrets of OWEN. CLIENT may use the

                                       4
<PAGE>   5

OWEN Confidential Information during the term of this AGREEMENT only as
permitted hereunder. CLIENT shall not disclose or provide any OWEN Confidential
Information to any third party or to any Affiliate of CLIENT, and shall take
reasonable measures to prevent any unauthorized disclosure by its employees,
agents, contractors or consultants during the term hereof including appropriate
individual nondisclosure agreements. The foregoing duty shall apply to any OWEN
Confidential Information for a period of ten (10) years from the date of the
receipt thereof by CLIENT. The obligations set forth in this Section shall
survive the termination of this AGREEMENT.

        Provided, however, that the following information shall not be
considered OWEN Confidential Information under this Section:

                (a)     information which is in or enters in the public domain
                        through no fault or act of CLIENT that is in breach of
                        the AGREEMENT;

                (b)     information which was independently developed by CLIENT
                        without the use of or reliance on the OWEN Confidential
                        Information; or

                (c)     information which was provided to CLIENT by a third
                        party under no duty of confidentiality to OWEN.

        LIMITED WARRANTY. OWEN represents and warrants to CLIENT that (a) OWEN
has the lawful right to grant the rights to the SUPPLYLINE(R) SYSTEM as set
forth herein; (b) as of its shipment date from OWEN, OWEN has no knowledge that
the SUPPLYLINE(R) SYSTEM infringes any third party intellectual property rights,
such as patents, copyrights, trade secrets or trademarks, in the United States;
and (c) the media containing the SUPPLYLINE(R) SYSTEM will be free from defects
in materials and workmanship under normal use and service for a period of ninety
(90) days from the delivery of the SUPPLYLINE(R) SYSTEM, except as set forth in
this section, the SUPPLYLINE(R) SYSTEM is provided to the CLIENT "as is". OWEN
expressly disclaims any representation or warranty that the SUPPLYLINE(R) SYSTEM
is or will be free of errors.

        The warranties set forth above with respect to the SUPPLYLINE(R) SYSTEM
are in lieu of all other warranties, express or implied, which are hereby
disclaimed by OWEN, including any warranty of merchantability or fitness for a
particular purpose or use. No representative of OWEN is authorized to make any
modification, extension or addition to the warranties set forth in this section.

        INFRINGEMENT INDEMNITY AND LIMITATION OF REMEDIES. OWEN hereby agrees to
indemnify, defend and hold CLIENT harmless from any and all lost, cost damage or
expense arising out of any third party suits, claims, or demands or other legal
action

                                       5
<PAGE>   6

("Legal Action") that alleges the SUPPLYLINE(R) SYSTEM infringes any United
States patent, copyright, or trade secret, including any reasonable costs or
legal fees incurred by CLIENT as a result. However, CLIENT shall give written
notice of any Legal Action to OWEN within twenty (20) days of its first
knowledge thereof, and any failure by CLIENT to give such notice to OWEN shall
relieve OWEN of its duty of indemnification hereunder. OWEN shall have sole and
exclusive control of the defense of any Legal Action, including the choice and
direction of any legal counsel. CLIENT shall not settle or compromise any Legal
Action without the written consent of OWEN; and CLIENT shall cooperate with OWEN
with respect to all Legal Actions.

        If the SUPPLYLINE(R) SYSTEM is found to infringe any third party
intellectual property right in a Legal Action, at OWEN's sole discretion and
expense, OWEN may:

        (a)     obtain a license from such third party for CLIENT's benefit at
                no further cost to CLIENT; or

        (b)     replace or modify the SUPPLYLINE(R) SYSTEM so that it is no
                longer infringing; or

        (c)     if neither of the foregoing is commercially feasible in the
                opinion of OWEN, terminate this AGREEMENT, in which case a
                prorated portion of the License Fee will be refunded to CLIENT
                in the event of termination.

        The foregoing indemnification shall not extend to, and OWEN shall have
no liability for, any infringement resulting from the use of the SUPPLYLINE(R)
SYSTEM with any software or program not supplied by OWEN. Furthermore, OWEN
shall have no liability or obligation to indemnify CLIENT pursuant to the
foregoing provisions if CLIENT fails to use a non-infringing version or release
of the SUPPLYLINE(R) SYSTEM if made available by OWEN.

        LIMITATION OF DAMAGES AND REMEDIES. In no event other than intellectual
properties infringement, as defined above, shall the liability of OWEN include
any special, indirect, incidental or consequential loss or damage, even if OWEN
has been advised of the possibility of such potential loss or damage, including
any liability for damages arising out of or resulting from the use, maintenance
of performance of the SUPPLYLINE(R) SYSTEM. The foregoing disclaimer shall
extend to any liability for loss or corruption of the SUPPLYLINE(R) SYSTEM by
CLIENT. OWEN'S liability of any kind (including liability for negligence) with
respect to the SUPPLYLINE(R) SYSTEM and all other performance or non-performance
by OWEN or its agents shall be limited to the amount of maintenance and license
fees paid by CLIENT to OWEN.

                                       6
<PAGE>   7

        TERMINATION OF LICENSE. If either party breaches or defaults under any
material provision of this AGREEMENT, and such default is not cured within
twenty-five (25) days after such defaulting party's receipt of a written notice
by the non breaching or non-defaulting party specifying the nature and extent of
such breach or default, then the non-defaulting party may elect to terminate
this AGREEMENT in its entirety, or seek such other legal or equitable relief as
to which it may be entitled. In the event of breach by OWEN, CLIENT may seek
damages including the return of License Fees.

        Within ten (10) days of termination of this AGREEMENT for any reason (by
either CLIENT or OWEN), CLIENT shall return to OWEN or shall erase and destroy
any copies in its possession of (a) the SUPPLYLINE(R) SYSTEM, (b) any
documentation related to the SUPPLYLINE(R) SYSTEM, and (c) any other
Confidential Information of OWEN in tangible form. CLIENT shall then certify in
writing to OWEN that it has so returned or erased and destroyed such materials.

        GOVERNMENTAL USES. If CLIENT will employ the SUPPLYLINE(R) SYSTEM on
behalf of any unit, office, agency or instrumentality of the U.S. Government,
the SUPPLYLINE(R) SYSTEM is subject to "Restricted Rights," as that term is
defined in the Department of Defense Supplement to the Federal Acquisition
Regulations, P.252.227-7013(c)(1), or in the Federal Acquisition Regulations,
P.52.227-19(c)(2), as may be applicable, or any successor rules or regulations.
Any use, duplication or disclosure of the SUPPLYLINE(R) SYSTEM by the U.S.
Government shall be subject to such regulatory restrictions. For purposes of the
foregoing regulations, the Contractor/Manufacturer is: Owen Healthcare, Inc.,
1330 Enclave Parkway, Houston, Texas, 77077.

        YEAR 2000 ISSUES. The SUPPLYLINE SYSTEM is (to the extent applicable),
(1) Year 2000 compliant and allows for date data century recognition,
calculations that accommodate same century and multi-century formulas and date
values, and date data interface elements that reflect the proper century, and
(ii) free of any known bugs or defects, and to the best knowledge of OWEN, is
and shall be useable in the same form from and after the EFFECTIVE DATE.

        MISCELLANEOUS.

        1.      Multiple Counterparts. This AGREEMENT may be executed in two or
                more counterparts, each of which shall be deemed as original,
                but which together shall constitute one and the same instrument.

        2.      Binding on Assigns. This AGREEMENT shall extend to and be
                binding upon and inure to the benefit of the parties hereto,
                their respective successors and assigns. Except as expressly
                provided herein, this AGREEMENT may not be assigned by either
                party without the prior

                                       7
<PAGE>   8

                written consent of the other party, which consent may be
                withheld by the sole discretion of such other party.

        3.      Other Agreements/Amendments. This AGREEMENT sets forth the
                entire understanding of the parties and supersedes all prior
                agreements or understandings, whether written or oral, with
                respect to the subject matter hereof. No terms, conditions,
                warranties, other than those contained herein, and no amendments
                or modifications hereto shall be binding unless made in writing
                and signed by the parties hereto.

        4.      Notices. Any notice, demand or other document required or
                permitted to be delivered hereunder shall be in writing and may
                be delivered personally or shall be deemed to be delivered three
                (3) days after such notice is deposited in the United States
                mail, postage prepaid, registered or certified mail, return
                receipt requested, addressed to the parties at their respective
                address indicated below, or at such other addresses as may have
                theretofore been specified in written notice delivered in
                accordance herewith.

                If to OWEN:

                  Owen Healthcare, Inc.
                  1330 Enclave Parkway
                  Houston, TX 77077
                  Attention: Sr. Vice President, Diversified Services

                  With a copy to:
                  Owen Healthcare, Inc.
                  1330 Enclave Parkway
                  Houston, TX 77077
                  Attention: General Counsel

                If to CLIENT:

                  Medibuy.com, Inc.
                  7777 Alvarado Road
                  La Mesa, CA 91941
                  Attention: Director, Catalog Management

        5.      Open Records. Pursuant to the requirements of 42 CFR 420.300 et
                seq., OWEN agrees to make available to the Secretary of Health
                and Human Services ("HHS"), the Comptroller General of the
                Government Accounting

                                       8
<PAGE>   9

                Office ("GAO") or their authorized representatives, all
                contracts, books, documents and records relating to the nature
                and extent of costs hereunder for a period of four (4) years
                after the furnishing of services hereunder for any and all
                services furnished under this Agreement. In addition, OWEN
                hereby agrees to require by contract that each subcontractor
                makes available to the HHS and GAO, or their authorized
                representative, all contracts, books, documents and records
                relating to the nature and extent of the costs thereunder for a
                period of four (4) years after the furnishing of services
                thereunder.

        6.      Controlling Law. This Agreement and the performance of the
                parties hereunder shall be controlled and governed by the laws
                of the State of Texas.

        7.      Invalidity of Certain Provisions. If any provision of this
                Agreement is held to be illegal, invalid, or unenforceable under
                present or future laws effective during the term hereof, such
                provision shall be fully severable and this Agreement shall be
                construed and enforced as if such illegal, invalid, or
                unenforceable provision had never comprised a part hereof, and
                the remaining provisions hereof shall remain in full force and
                effect and shall not be affected by the illegal, invalid, or
                unenforceable provision or by its severance from this Agreement.
                Furthermore, in lieu of such illegal, invalid or unenforceable
                provision, there shall be added automatically as a part of this
                Agreement a provision as similar in terms to such illegal,
                invalid, or unenforceable provision as may be possible and still
                be legal, valid or enforceable.

        8.      Press Releases. Except as required by law, it is understood that
                all press releases or other public communication of any sort
                relating to this Agreement and the method of the release for
                publication thereof, will be subject to the prior written
                approval of both parties.

        9.      Interpretation and Effect. This Agreement terminates and
                supersedes any existing agreement pertaining to the same subject
                matter between the parties hereto. This Agreement, as executed
                and approved, shall not be modified unless in writing, expressly
                stating its intent to modify the terms of this Agreement, and
                signed by the parties hereto.

                                       9
<PAGE>   10

        IN TESTIMONY WHEREOF, THIS INSTRUMENT IS EXECUTED as of the day and year
first above written.

OWEN HEALTHCARE, INC.                       MEDIBUY.  COM, INC.

/s/ RICHARD A. HEARD                        /s/ KATHLEEN H. PENA
----------------------------------          ------------------------------------
Richard A. Heard                            KATHLEEN H. PENA
Sr. Vice President, Diversified Services    VICE PRESIDENT

                                       10
<PAGE>   11
                              [SCHEDULES OMITTED]

                                       11

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