The HORI SNES Classic Fighting Commander gamepad isn’t a deal; $25 is its regular price, but I imagine it might get hard to find once people start getting SNES Classics in their hands starting tomorrow. It’s designed specifically for fighting games, but it’ll work with all 21 titles on the SNES Classic, and <heavenly angels sing> it’s wireless!
Barring this, you should definitely get some extension cords for the console’s two bundle controllers, which have cables less than five feet in length.