I'd have to say my Interstate '76 Arsenal Gold Edition. My mother picked up this game for $1 at a library sale and I only played it once because I couldn't stand playing it anymore. Anyways, I looked it up and it goes for around $70 to $100. Oh wait, that's if it's new. Well, they don't have to know that...I won't sell it anyways. It's a cool little addition to my collection to shove in my friend's faces.
IT'S HERE! And it's bigger than I thought it would be! No one knows just how he was sold/obtained, or even if he originally came with a box, but what is known is that this ultra rare statue of Eggman was available only in Japan around 1992. Finally I have one!
I don't have much but I guess it has to be a Pokemon Themed GBA. Not one of my friends have one but then again,half of them barely know what a GBA is..for some reason!