Amazon.com: Super Smash Bros. GameCube Adapter for Wii U : Nintendo Gamecube Controller Adapter: Video Games
Amazon.com: Y Team Controller Adapter for Gamecube, Compatible with Nintendo Switch, Super Smash Bros Switch Gamecube Adapter for WII U/PC with 4 Port : Video Games
WHOA! GameCube Adapter Works on Nintendo Switch! - We Show it Off! - YouTube
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB – Lexuma
Nintendo GameCube Controller Adapter for Nintendo Switch - Walmart.com
The Nintendo Switch now supports GameCube controllers - The Verge
Wii U Gamecube Controller Adapter〔USA〕 Brook Gaming - Official Brook Gaming Store
Nintendo Support: How to Use the GameCube Controller With Nintendo Switch
Does the USB to gamecube adapter work in Wii mode on the Wii U? : r/wiiu
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB by L
Amazon.com: Gamecube Controller Adapter for Switch/Switch OLED.Gamecube Adapter Compatible with PC Wii U.Adapter with 4 Ports 6 FT(1.8M) Cable Support Turbo and Vibration Features Super Smash Bros : Video Games
GameCube Controller Adapter 4 Port Compatible with Nintendo Switch Wii U & PC USB
Just found out the Wii-U adapter works on switch! It's time to get serious about smash. : r/gaming