three sites that will tip you off to the best deals on finding one:
TechBargains
AnandTech Deals Forum
FatWallet Forums
(browse the Hot Deals message board)
All three are independent of any retailer, and merely call out great deals that are running.
Be prepared though, because after seeing all the good deals on both you will be saving yourself broke. LOL. I buy A LOT of stuff of I don't really need because I can get it at a great price...
(note: FatWallet has been down on and off today--keep trying if you can't get on).