GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB by L
Amazon.com: Y Team Controller Adapter for Gamecube, Compatible with Nintendo Switch, Super Smash Bros Switch Gamecube Adapter for WII U/PC with 4 Port : Video Games
GameCube Controller Adapter for Wii U and PC USB Two ports
For Gamecube Controller Adapter For Nintendo Switch Wii U Pc 4 Ports With Turbo And Home Button Mode No Driver - Accessories - AliExpress