Amazon.com: Arrocent GC Controller, Replacement for Gamecube Controller, Compatible with Wired USB Game Cube Controller/PC Windows 7 8 10 (ClearBlue) : Video Games
4 Controllers for Gamecube with 4 Extension Cables and 4-Port USB Switch PC Wii 6910201412257 | eBay
Amazon.com: TALK WORKS Wired GameCube Controller - Gaming Controller Compatible with Nintendo Switch - USB-A Connection - Nintendo Switch Controls And Turbo Function - 9ft Cable - Black : Video Games
Amazon.com: HORI Nintendo Switch Battle Pad (Zelda) GameCube Style Controller - Nintendo Switch : Everything Else
Amazon.com: Old Skool GameCube Controller Adapter for Switch, Wii U, and PC USB, 4 Port : Video Games
4 Controllers for Gamecube,with 4 Extension Cables and 4-Port USB Adapter for Switch PC Wii U Console (BBRG)
Amazon.com: Mayflash GameCube Controller Adapter for Wii U, PC USB and Switch, 4 Port : Video Games
Eight Player GameCube Adapter Is Ready For Smash | Hackaday
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB – Lexuma
Gamecube USB controller not working : r/DolphinEmulator
GameCube Controller Adapter for Wii U and PC USB Two ports