Sites vary not only in price, but in efficiency, ease of use, inventory ready to ship, and return policy.
Software is available from many sites both for download and mail delivery.
Few things are more frustrating than paying for software that doesn't download correctly or gets interrupted, leaving you with no clear idea of how to proceed. When ordering packaged software, check the company's return policy. Jostling in boxes can leave CDs scratched, rendering them useless. Some companies require a restocking fee even for damaged products, and given the competition, there's no need to accept this. Also, many companies offer student discounts.