Nintendo GameCube controller adapter coming to Wii U for Smash Bros. - Polygon
Amazon.com: Old Skool Controller Compatible with Gamecube/Wii - White : Video Games
Gamecube Controller, Wired Controller Gamepad Compatible With Nintendo Wii/ gamecube - Enhanced (blue & Red) | Fruugo JP
Amazon.com: Dliaonew 2.4G Wireless Gamecube Controller, Classic Gamecube Wii Controller with Receiver Adapter for Wii Gamecube NGC (Pink and Blue) : Video Games
Old Skool GameCube / Wii Compatible Controller - Pink Special Edition - Walmart.com
Nintendo Wii GameCube Controller - WHITE - Videogamesnewyork
Is it possible to mod your Wii U to connect to the wireless switch GameCube controller? : r/WiiUHacks
Amazon.com: FIOTOK Gamecube Controller, Classic Wired Controller for Wii Nintendo Gamecube (Blue & Red-2Pack) : Video Games
2 Pack Controller Replacement for Gamecube Controller,Wired Controllers Classic Gamepad compatible with Nintendo and Wii Console Game Remote(Black 2 pcs) - Newegg.ca
How to Connect a GameCube Controller to the Wii - Howchoo
List of GameCube Controller-compatible Wii video games - Codex Gamicus - Humanity's collective gaming knowledge at your fingertips.
Tutorial: How to use your GameCube Controller Adapter for Wii U on the vWii - YouTube