Another +1 for F3 carts. I imagine a lot of those puzzle and platform games are really cheap in JP. Tops has a lot of them for 3,000-5,000 yen - ones that sell for $60-80+ here.
Agreed! Another +1 for Taito F-3 Carts!
Also, I would like a Mega Man: The Power Battle PCB, the cheapest I see them on eBay with shipping is $160+.