Best Buy's Buy 2 Get 1 Free deal is better than you think
it's buy ANY 2 games (under $59.99) and get any game (under $59.99) Free
Rock Revolution @ Best Buy is on a company wide clearance for $5
so you could go and get 2 copied of Rock Revolution for $10 and get Uncharted 2 for Free
actually if you find Rock Revolution @ BB, grab all the copies you can find, because every 2 get you a free game.
Hurry because stock is limited, but any other cheap game (for PS360 and Wii) will do.