Here's the deal....I built a Playchoice-10 for my wife. She originally just wanted a Super Mario Brothers, but then changed her mind. I am now looking for a SMB cart for the PC-10 board. I have SMB 2 and 3, if interested in a trade.
I'm also looking for Gradius and a couple of others. If someone has SMB and Gradius, I would offer to trade a complete working Vs. board with SMB installed(tested working), and a Gradius daughter card (untested).
If you are looking for other parts for trade, let me know. I may have something.