NewEgg - Crucial Ballistix 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory for $69.99 after Rebate, Shipped Free!:
Offer: Awesome deal for this dual channel kit for 2GB of 240-pin DDR3 800 desktop RAM. With RAM this cheap, you really should optimize your system, especially if you're looking to go with Windows Vista. Crucial is a very good company with great customer service and high quality modules.