All I've really got is some old currency- Polish and Greek coins that I don't know why I keep.
I do keep one of the polish ones on hand for coin flipping, though.
I also have a 30cm tall statue of a certain character, which probably isn't as rare as I want to believe, but it was sure as hell expensive.
EDIT: After some quick research, I've learned that two of my GBA games are pretty rare- Castlevania: Harmony of Dissonance, and Aria of Sorrow, of the same series. The original carts are becoming rather rare, it seems.
I do keep one of the polish ones on hand for coin flipping, though.
I also have a 30cm tall statue of a certain character, which probably isn't as rare as I want to believe, but it was sure as hell expensive.
EDIT: After some quick research, I've learned that two of my GBA games are pretty rare- Castlevania: Harmony of Dissonance, and Aria of Sorrow, of the same series. The original carts are becoming rather rare, it seems.