This Nintendo Switch adapter turns your GameCube controllers wireless - The Verge
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
Nintendo Support: How to Use the GameCube Controller With Nintendo Switch
PowerA Wireless GameCube Controller for Nintendo Switch Gold | GameStop
Amazon.com: GameCube Controller Adapter (Nintendo Switch) : Video Games
Amazon.com: Nintendo GameCube Controller Adapter (Nintendo Switch) JAPAN Import without English Manual : Video Games
Amazon.com: GameCube Controller Adapter : Video Games