Mayflash Dual Pack For Gamecube Gc Controller Adapter Converter For Wii For Wiiu - Accessories - AliExpress
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB – Lexuma
Portholic Gamecube Controller Adapter with 4 Ports Compatible with Wii U, Nintendo Switch for Super Smash Bros Ultimate (No Drivers Needed) - Black - Newegg.com
Mayflash GameCube Controller Adapter for Wii & Wii U (Dual Pack) (W014 – SupremeGameGear