If I'm not mistaken...those are Neo Geo hyper 64 cartridges....I think thats what its called. Dunno the prices on those, guessing somewhere in the $50-$125 range each depending on the buyer.. Don't think any of the hyper 64 games ever made it big. Remember there was a samurai shodown 64 that was supposed to be the answer to segas virtua fighter series. What games are they?
Tom