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GameCube Controller Adapter for Wii U & PC USB for Windows, Wii U
Amazon.com: Gamecube Adapter for Nintendo Switch Gamecube Controller Adapter and WII U and PC, Super Smash Bros Gamecube Controller Adapter. Support Turbo and Vibration Features with 180cm Long Cable : Video Games
SEALDE Official GameCube Controller Adapter Switch Wii U Super Smash Bros + Gift | eBay
Best Nintendo Switch GameCube Controller Adapters | Digital Trends
Ultimate GameCube Adapter by Panda Hardware — Kickstarter
You can use the Smash Brothers Gamecube adapter in portable mode with a USB C adapter (Rumble works too) : r/NintendoSwitch
Nyko Retro Controller Adapter Single 1- Port GameCube Controller Adapt – Gametronex.com