I've bought several computers from http://www.macofalltrades.com

They sell used macs as well as upgrades. Macs do tend to maintain their value for a few years anyway, so you don't get a huge discount on newish machines. But they're a great source for older hardware on the cheap, and it comes with a short warranty that you can extend. Customer service on the phone is also excellent.


I work for the Department of Redundancy Department