Should You Buy the TTX Tech WaveDash 2.4GHz Wireless Controller for the Nintendo GameCube - YouTube
Switch Gamecube Controller Adapter, Super Smash Bros Gamecube Adapter for Nintendo Switch, Wii U and PC USB with 4 Ports - Plug & Play, No Drivers Needed - Newegg.com
TTX Tech WaveDash Review: Not Quite It — GameTyrant
TTX Tech GameCube Compatible 4 Port Controller Adapter for Wii U and Switch 849172004764 | eBay
Puloru 4 Port Controller Adapter for GC to Switch/WII U/PC Conversion Box - Walmart.com