Currently up for auction on ebay is a rather rare piece of hardware. Behold, a Mega Man 3 "Play Choice" mother board.
The board once belonged to an arcade based version of Mega Man 3 that graced Nintendo's little known Play Choice 10 cabinets in the early 90's. (Read more on that here)
Bidding begins at $4.99 plus an additional $12. Buyer beware, the board is used and untested; might turn out to be something really special or a piece of junk. Also if you do manage to win, make sure you have some sort of arcade cabinet to play the game.
Complete auction here.