E-NET Gamecube Controller Adapter, 4 Ports for Gamecube Controller USB Adapter Converter for Wii U PC NGC & PC Game Accessory, Support Windows XP, Vista, for Windows 7/8, 32-bit and 64-bit Nintendo
GameCube Controller Adapter for Wii U and PC USB Two ports
Switch Pro Controller USB-C to GameCube Cable - ProGCC | Hand Held Legend
USB-C to GameCube/Wii Cable – Frame1
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 Nintendo Wii U Systems - Newegg.com
raphnet. - Gamecube to USB adapter - V3
Amazon.com: Mayflash GameCube Controller Adapter for Wii U, PC USB and Switch, 4 Port : Video Games
Retro Link GameCube Style USB Wired Controller - Walmart.com
Amazon.com: 4 Controllers for Gamecube，with 4 Extension Cables and 4-Port USB Adapter for Switch PC Wii U Console (BBRG) : Video Games
Amazon.com: GameCube Controller Adapter : Video Games
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB – Lexuma
N64/Gamecube controller to USB adapter
raphnet. - Gamecube to USB adapter - V3
4 Port Gamecube NGC Controller Adapter Nintendo Wii U Switch & PC Adaptor USB UK 5055538676024 | eBay
YEUHTLL 4 Ports Converter for GameCube GC Controller, USB Adapter Plug & Play for NS Switch NGC/Wii U/PC Star Fighting Games - Walmart.com
Retro Controller Adapter for Nintendo Switch™ – Nyko Technologies
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB – Lexuma
Amazon.com: CirKa Premium GameCube USB Controller for PC/ Mac (Black) : Video Games
You can use the Smash Brothers Gamecube adapter in portable mode with a USB C adapter (Rumble works too) : r/NintendoSwitch
NEXiLUX Nintendo Switch GameCube Controller Adapter for Wii U, PC USB – J&L Video Games New York City
