Hori Mario GameCube Controller for Wii U Turbo - Mint Condition Tested 45496950453 | eBay
List of GameCube Controller-compatible Wii video games - Codex Gamicus - Humanity's collective gaming knowledge at your fingertips.
raphnet. - Gamecube controller to Wiimote adapter
Just Got One of Those Gamecube Controllers That Plug Into the Wii Remote. What's the Difference Between These and the Actual Gamecube Controllers? : r/smashbros
Cipon Gamecube Controller, Wired Controller Gamepad Compatible with Nintendo Wii/GameCube - Enhanced (Blue & Red) : Amazon.com.au: Video Games
Japanese auction reveals Nintendo's first Wii remote—for the GameCube | Ars Technica