Best/Cheapest GameCube PCB that uses common grounds?

Can anyone recommend some GameCube PCBs that use a common ground setup? I need to wire the PCB to another common ground PCB in a stick. I was operating on the assumption that the Pelican Universal Arcade Fighter PCB was common ground, but turns out it’s not. :frowning:

Well, after some digging around, I found that the Pelican Retro Digital Pad uses common grounds. If anyone discovers another, please post it here.