Mine would have to be Pac-Man World 2 for the original Xbox. I played it over at a friends house many years ago and thought it was a pretty good game. Played my copy recently and the platforming is pretty unbearable sometimes. The overall game sadly just didn't age well.

I found one of my favorite games, Eternal Darkness, for $6. I was so happy. One other cool thing to note about it is that it has "For Display Only" on it. Love this game so much.

@Eikichi-Onizuka: I highly agree with you on this! I have the most nostalgia for the N64, but I love the PS1 aesthetic, and how influential how all the games were (its funny to think that a lot of the most popular game series were spawned from it). Finally we have the Saturn which I actually have only gotten to play last year but I can tell it is quite the fun console. The Saturn has a lot of great games even though it didn't get the shelf life it wanted.