EXHIBIT 10.50

FOURTH AMENDMENT TO LOAN AND SECURITY AGREEMENT

THIS FOURTH AMENDMENT TO LOAN AND SECURITY AGREEMENT (this
"Amendment"), dated as of May 3, 2004, is entered into among CONGRESS FINANCIAL
CORPORATION (WESTERN), a California corporation ("Lender"), and PC MALL, INC., a
Delaware corporation formerly known as IdeaMall, Inc. ("PC Mall"), PC MALL
SALES, INC., a California corporation formerly known as Creative Computers, Inc.
("PC Mall Sales") ECOST.COM, INC., a Delaware corporation ("ecost"), ELINUX.COM,
INC., a Delaware corporation ("eLinux"), CCIT, INC., a Delaware corporation
formerly known as Creative Computers Integrated Technologies, Inc. ("CCIT"), WF
ACQUISITION SUB, INC., a Delaware corporation ("WF Sub"), COMPUTABILITY LIMITED,
a Delaware corporation ("Computability"), AF SERVICES, INC., a Delaware
corporation ("AF Services"), PC MALL GOV, INC., a Delaware corporation ("PCMG"),
SIFY, INC., a Delaware corporation formerly known as ClubMac, Inc. ("SIFY"),
ONSALE, INC., a Delaware corporation ("Onsale"), AV ACQUISITION, INC., a
Delaware corporation ("AV Acquisition"), MALL ACQUISITION 1, INC., a Delaware
corporation formerly known as PCM.com, Inc. ("Acquisition 1") and MALL
ACQUISITION 2, INC., a Delaware corporation formerly known as PCMall.com, Inc.
("Acquisition 2"), jointly and severally as co-borrowers (each a "Borrower" and
collectively, "Borrowers"). RECITALS

A. Borrowers and Lender have previously entered into that certain Loan and
Security Agreement dated March 7, 2001 as amended (the "Loan Agreement"),
pursuant to which Lender has made certain loans and financial accommodations
available to Borrowers. Terms used herein without definition shall have the
meanings ascribed to them in the Loan Agreement.

B. Pursuant to an initial public offering (the "ecost IPO"), PC Mall may sell
all or a portion of its stock in ecost and/or ecost may issue new stock. Prior
to the ecost IPO, ecost may modify its ownership structure by creating more than
one class of stock, with differing voting rights assigned to each such class. In
addition, immediately prior to the consummation of the ecost IPO, ecost may pay
to PC Mall a dividend, a portion of which may be paid in the form of a
promissory note (the "ecost Note") and the remaining portion of which may be
paid by the forgiveness of the capital contribution due from PC Mall outstanding
as of December 31, 2003. The ecost Note, if issued, may be repaid in whole or in
part from the proceeds of the ecost IPO.

C. After the ecost IPO, PC Mall may subsequently (i) assign or license
certain intellectual property associated with the ecost business to ecost,
sublease certain real property to ecost and/or agree to provide various products
and services to ecost and/or (ii) dividend to its shareholders some or all of
its remaining shares of the common stock of ecost.

D. Borrowers have requested Lender to consent to the transactions described
in Recitals B and C above and any transactions ancillary thereto (collectively,
the "ecost Transactions") and to amend the Loan Agreement, and Lender is willing
to provide such consent and to amend the Loan Agreement, all upon the terms and
conditions set forth below.

AGREEMENT

NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants herein contained, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereby
agree as follows:

1. ecost Transactions. Lender consents to, and waives any Event of
Default arising from, the ecost Transactions. Concurrently with the IPO and
without further action by any party hereto, Lender's security interests in the
property and common stock of ecost shall be deemed terminated and ecost shall be
deemed released as a Borrower under the Loan Agreement. Lender shall take
whatever steps are reasonably necessary to effectuate such termination and
release including, without limitation, filing of UCC statements removing ecost
as a debtor and returning to PC Mall any shares of stock in ecost which have
been pledged to Lender.

2. ecost Note. PC Mall agrees that it shall deliver or cause to be
delivered to the Lender the original ecost Note, if issued by ecost, duly
endorsed by PC Mall to the order of Lender, and agrees that it shall remit to
Lender any payments of interest or principal made to PC Mall under the ecost
Note, and any proceeds received by PC Mall from the ecost IPO, promptly upon
receipt. If requested by Lender, PC Mall agrees to execute written instructions
to ecost to the effect that the ecost Note has been assigned to the Lender and
all payments thereunder should be made directly to the Lender. Any amounts paid
to Lender in connection with the ecost Note shall be applied to the Revolving
Loans.

3. Effectiveness of this Amendment. Lender must have received the
following items, in form and content acceptable to Lender, before this Amendment
is effective. (a) This Amendment fully executed in a sufficient number of
counterparts for distribution to all parties.

(b) Consents duly executed and delivered by LaSalle Business Credit, LLC and
Fleet Capital Business Finance Division as Participants.

(c) All other documents and legal matters in connection with the transactions
contemplated by this Amendment shall have been delivered or executed or recorded
and shall be in form and substance satisfactory to Lender.

4. Representations and Warranties. Each Borrower represents and
warrants as follows:

(a) Authority. Such Borrower has the requisite corporate power and authority
to execute and deliver this Amendment, and to perform its obligations hereunder
and under the Financing Agreements (as amended or modified hereby) to which it
is a party. The execution, delivery and performance by such Borrower of this
Amendment have been duly approved by all necessary corporate action and no other
corporate proceedings are necessary to consummate such transactions.

(b) Enforceability. This Amendment has been duly executed and delivered by
such Borrower. This Amendment and each Financing Agreement (as amended or
modified hereby) is the legal, valid and binding obligation of such Borrower,
enforceable against such Borrower in accordance with its terms, and is in full
force and effect.

(c) Representations and Warranties. The representations and warranties
contained in each Financing Agreement (other than any such representations or
warranties that, by their terms, are specifically made as of a date other than
the date hereof) are correct on and as of the date hereof as though made on and
as of the date hereof.

(d) Due Execution. The execution, delivery and performance of this Amendment
are within the power of such Borrower, have been duly authorized by all
necessary corporate action, have received all necessary governmental approval,
if any, and do not contravene any law or any contractual restrictions binding on
such Borrower.

(e) No Default. No event has occurred and is continuing that constitutes an
Event of Default.

5. Choice of Law. The validity of this Amendment, its construction,
interpretation and enforcement, the rights of the parties hereunder, shall be
determined under, governed by, and construed in accordance with the internal
laws of the State of California governing contracts only to be performed in that
State.

6. Counterparts. This Amendment may be executed in any number of
counterparts and by different parties and separate counterparts, each of which
when so executed and delivered, shall be deemed an original, and all of which,
when taken together, shall constitute one and the same instrument. Delivery of
an executed counterpart of a signature page to this Amendment by telefacsimile
shall be effective as delivery of a manually executed counterpart of this
Amendment.

7. Reference to and Effect on the Financing Agreements.

(a) Upon and after the effectiveness of this Amendment, each reference in the
Loan Agreement to "this Agreement", "hereunder", "hereof" or words of like
import referring to the Loan Agreement, and each reference in the other
Financing Agreements to "the Loan Agreement", "thereof" or words of like import
referring to the Loan Agreement, shall mean and be a reference to the Loan
Agreement as modified and amended hereby.

(b) Except as specifically provided above, the Loan Agreement and all other
Financing Agreements, are and shall continue to be in full force and effect and
are hereby in all respects ratified and confirmed and shall constitute the
legal, valid, binding and enforceable obligations of Borrowers to Lender.

(c) The execution, delivery and effectiveness of this Amendment shall not
operate as a waiver of any right, power or remedy of Lender under any of the
Financing Agreements, nor constitute a waiver of any provision of any of the
Financing Agreements.

(d) To the extent that any terms and conditions in any of the Financing
Agreements shall contradict or be in conflict with any terms or conditions of
the Loan Agreement, after giving effect to this Amendment, such terms and
conditions are hereby deemed modified or amended accordingly to reflect the
terms and conditions of the Loan Agreement as modified or amended hereby.

8. Ratification. Each Borrower hereby restates, ratifies and reaffirms each
and every term and condition set forth in the Loan Agreement, as amended hereby,
and the other Financing Agreements effective as of the date hereof.

IN WITNESS WHEREOF, the parties have entered into
this Amendment as of the date first above written.

|LENDER:                                                                          | BORROWERS:                                                                    
|-------------------------------------------------------------------------------- | ------------------------------------------------------------------------------
|CONGRESS FINANCIAL
    CORPORATION (WESTERN)                                     | PC MALL, INC.                                                                 
|By:/s/
    Gary D. Cassianni
    Name:Gary D. Cassianni
    Title:Vice President | By:/s/
    Frank Khulusi
    Name:Frank Khulusi
    Title:President           
|                                                                                 | PC MALL SALES, INC.                                                           
|                                                                                 | By:/s/ Rory Zaks
    Name:Rory Zaks
    Title:President                       
|                                                                                 | ECOST.COM, INC.                                                               
|                                                                                 | By:/s/
    Gary Guy
    Name:Gary Guy
    
    Title:President                
|                                                                                 | ELINUX.COM, INC.                                                              
|                                                                                 | By:/s/
    Dan DeVries
    Name:Dan DeVries
    Title:President               
|                                                                                 | CCIT, INC.                                                                    
|                                                                                 | By:/s/
    Richard Lepow
    Name:Richard Lepow
    
    Title:President      
|                                                                                 | WF
    ACQUISITION SUB, INC.                                                  
|                                                                                 | By:/s/William
    C. Neary
    Name:William C. Neary
    Title:President      
|                                                                                 | COMPUTABILITY LIMITED                                                         
|                                                                                 | By:/s/
    Peter L. Zuiker
    Name:Peter L. Zuiker
    Title:President       
|                                                                                 | AF
    SERVICES, INC.                                                         
|                                                                                 | By:/s/
    Simon Abuyounes
    Name:Simon Abuyounes
    Title:President       
|                                                                                 | PC
    MALL GOV, INC.                                                         
|                                                                                 | By:/s/
    Alan Bechara
    Name:Alan Bechara
    Title:President             
|                                                                                 | SIFY,
    INC.                                                                
|                                                                                 | By:/s/
    Read Fenner
    Name:Read Fenner
    Title:President               
|                                                                                 | ONSALE, INC.                                                                  
|                                                                                 | By:/s/ Sam Khulusi
    Name:Sam Khulusi
    Title:President                   
|                                                                                 | AV
    ACQUISITION, INC.                                                      
|                                                                                 | By:/s/
    Theodore Sanders
    Name:Theodore Sanders
    
    Title:Secretary
|                                                                                 | MALL ACQUISITION 1, INC.                                                      
|                                                                                 | By:/s/
    Theodore Sanders
    Name:Theodore Sanders
    
    Title:Secretary
|                                                                                 | MALL ACQUISITION 2, INC.                                                      
|                                                                                 | By:/s/
    Theodore Sanders
    Name:Theodore Sanders
    
    Title:Secretary