For a very dramatic appearance, you can print your outside message on one page of a 24lb Bond and the inside message on another same sized sheet of a different colour of finish. Once printed, and using a spray adhesive, laminate the two sheets together. You'll be very pleased with the result. In some cases, you can buy it with micro perfs to the exact business card size. Once printed you tear along the micro perfs to get instant business cards.
Many companies have to re-assign staff to new and sometimes temporary roles.
It always seems to take forever to get business cards. To avoid this, sheet stock can be pre-printed with standard colour logos. At 6 pages per minute, the laser printer will produce 500 of them in less than 10 minutes. A variety of business applications require the use of Bar Codes such as UPC-A, I 2 of 5, Code 39, etc. Software is available from a number of sources to generate this symbology.