Sealed Cheatamen II for the NES
Action 52 was probably one of the worst collection of games of all time. Cheetahmen II┬ was completed but never fully released though later on someone discovered copies of it and sold them. In this hobby of ours, this type of thing happens very often (bad game + canned release + few leaked released = insta-rarity) but not often enough so say the least. Copies of this game usually command a hefty price tag. Heres a sealed one with less than a day left and currently at $1,200+.