The rebate is good if you buy the kit at any of these sites:
Amazon.com, Buy.com, CDW, Comp-U-Plus, Computers4Sure, DataVision, Ebuyer, Gateway, Insight, J&R Computer World, Newegg.com, OnSale, PC
Mall, PC Connection, PC Nation, PC Universe, Provantage, RCS, TechDepot, The Nerds, and...