uBid.com

Bid on any computer of your choice to win it for a very good price.  Every popular brand computers can be found at uBid.  It is one of the largest online auction available right now.  That is all why it is excess inventory from the world's most trusted brands.

Overstock

Overstock is one of the largest auction for anything  you need on the internet.  They have tons of computers at wholesale prices.  Take advantage of that and go for their live auctions.  There are tons of computers that can be bought for very cheap.