Apparently you can buy a SNES Controller for $10 if you call Nintendo (if you want to use a SNES pad for your Wii, WiiU... NES Classic?)
https://www.reddit.com/r/miniSNES/comments/7qasy7/psa_nintendo_has_snes_classic_controllers/
https://www.reddit.com/r/miniSNES/comments/7qasy7/psa_nintendo_has_snes_classic_controllers/