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GameCube Controller Adapter 4 Port Compatible with Nintendo Switch Wii U & PC USB
GameCube® Controller Adapter - XYAB
TTX Tech GameCube Controller Adapter for Wii U and Switch - Micro Center
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Retro-Bit Prism HD Adapter for GameCube Upscaler for 1080P Support – Gametronex.com
Mayflash GameCube Controller Adapter for Wii U and PC USB (4 Port) - Walmart.com
GameCube Controller Adapter 4 port For nintendo Switch Wii U & PC USB NEW TURBO | eBay