GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB by L
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Best Nintendo Switch GameCube Controller Adapters | Digital Trends
8Bitdo Gbros Adapter for Nintendo Switch (Works with Wired Gamecube & Classic Edition Controllers) - Stone Age Gamer
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Retro Controller Hub for Nintendo Switch™ GameCube Controller Adapter – Nyko Technologies
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB – Lexuma