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NewEgg currently has two GeForce 6800 GT retail boards selling for less than $400, which are indeed great deals considering just a month ago you would be lucky to get one for less than $450 which is well above the list price.
Finally if you are more of an ATI guy, currently the cheapest X800 Pros I found were InfoTek's and Sapphire's, selling for $422 and $425, respectively. Definitely not a bad time to upgrade your videocard.