Pacificgeeks.com

I've bought a few systems from them over the years. Cheap and easy to deal with.

Or, look at Dell's refurbished systems, which I'm typing from now.
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Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein