My best game deal ever was probably back when Halo 2 had just come out. I was at Blockbuster and noticed that a Halo 2 box had a mislabeled price sticker on it. Instead of how much it should regularly cost brand new ($59.99 I believe) it said $5.99. I took it to the register and they noticed something was wrong, but sold it to me anyway. I didn't even have an Xbox at the time but I couldn't pass up on it. At a different Blockbuster I was also able to get brand new copies of Beyond Good and Evil and Psychonauts (both PS2) for seven dollars each. I know that isn't really a spectacular deal now, but at the time it was great. Also, last year when one of my friends moved away he sold me his very clean NES for 10 dollars and a bunch of really great games (Metroid, Zelda, Castlevania, Final Fantasy, etc etc) for two dollars each. Happy times!