Honestly I would just try to get a cart and call it good. As a diehard Mega Man fan,I have seen maybe a dozen or so of these carts but never a cib copy,only the sealed copy that a member on here has. I would probably chop off my penis to acquire it but it’s definitely not changing hands likely ever. He also has a manual which that one is probably worth a right or left testicle...maybe both. Again,it’s not changing hands much to my dismay.
There is a site called Mercado Libre which is like a central/South American/Latin oriented eBay that I used to frequent and I would see those carts pop up from time to time,but once people realized what those carts were and they started fetching good coin on eBay,those carts basically vanished off of that site. Most of the carts had moderate wear on them as well.
Anyway,best of luck to you!!