Sony PlayStation 3 for $225

(update: eToys no longer appears on Bing...they must have run through their budget pretty fast)

eToys is selling the Sony PlayStation 3 (120GB) game console for $299.99, but you can get 25% off by shopping through Bing. You'll have to search Bing.com for the right keywords, and then follow the gold coin to make sure you get your 25% back.  You'll need to pay for sales tax on $300, but it's still a good price for the game console / Blu-Ray player.

Also check out the Nintendo Wii for $150 after Bing cashback.