I bought a bunch of 72 pin to 60 pin converters and found I only needed a few for my little experiments. I have 2 left over, they are open for trade or paypal. These enable NES carts to be played on a Famicom. Please pay attention to that fact!
I'm after the following NES carts in good shape, labels intact, willing to buy:
Powerblade
Shatterhand
Pac Man (Tengen preferably)
Lolo 2