I've got an old orange Donkey Kong G&W, it still works. But I lost the battery cover and because it uses button batteries, you need to continuously push them in while playing.
I dont know if it's REALLY that rare, but i have a special GBA SP that looks like the old NES controller. I've never seen another one, but i don't know.
I also have my original n64 with quite a few games i got from gamestop a few years ago, and i have the original 3 spyro games <3
And the most rare of them all, i have a Sega Saturn with NiGHTS into Dreams. I still have the booklet and CD case somewhere... got it from ebay.
also i have some really old pokemon figures from back in the day and from the now closed pokemon center. :3
I have a copy of Mystical Ninja Starring Goemon for the Game Boy. It's sort of like Zelda, but not.
(I also have the N64 version, but I think the GB version is rarer.)