There was an article on the Neo Geo in Hyper magazine (Australia) that said MVS kits cost about $500-1000US, which was still a lot less than a replacement game or cabinet. AES games were at least $200-250US at the time. The AES and MVS had physically different pcb connectors in order to dissuade arcade operators from buying the cheaper AES version of the game and using it on their MVS cabs.
I'm talking... new. How did operators order carts? Were there catalogs or something? I know there were rentals... How did they get those? Who were cabs ordered from? What did all this stuff cost brand new?