Computers are sold through a variety of channels, including retail stores, direct vendors, mail order firms, computer stores, and value added resellers (VARs).

Retail stores tend to have fairly good pricing, but offer a limited choice of models and almost no advice. They are usually a good choice only if they stock exactly what you need.

Direct sales vendors such as Dell and Gateway 2000 are significant players in the computer market. These firms sell direct from the factory, and tend to combine good prices and attractive service policies.

Mail order stores are most suitable for very knowledgeable consumers. Mail order offers the best bargains, but also the greatest risk of receiving a sub-par system. As a result, businesses buying through mail order should be careful to investigate both the firm and the model before buying.

Computer stores are often a good source for advice and technical help. Most computer dealers stock a wide number of models, plus most important peripherals. However, dealers tend to be more expensive than other sources.

VARs generally have the highest level of knowledge about systems, particularly in setting up computer networks. While you can expect to pay a 10% premium for the service and advice of a VAR, you will receive on-site assistance to help set up the system and fix any problems that may arise.