raphnet. - N64 controller to Wii/Gamecube adapter (v2)
raphnet.] Classic controller to Gamecube/Wii adapter | eBay
raphnet. - Genesis/SMS/Atari controller to Wii/Gamecube adapter (v2)
Wii Guitar / Classic Controller to USB Adapter for Clone Hero – DDRPad.com
Megadrive/SMS/Atari controller to USB adapter (v2) – Performance Gaming
Wii Guitar / Classic Controller to USB Adapter for Clone Hero – DDRPad.com
Raphnet makes an adapter cable that converts a classic controller (Wii classic, Wii classic pro, NES classic, SNES classic) into a GameCube port. If you can't stomach paying $200 for the Hori