8bitdo makes a Bluetooth adapter for SNES.

https://www.amazon.com/dp/B01JU57ES6/ref=cm_sw_r_apa_i_XP28NR6GNP2TTCT41SQR_0

ah, yea, the bundle ones are hard to find these days since it's easier (and more cost effective) to just sell the controllers. luckily, all someone would need is their retro receiver https://www.amazon.com/Gam3Gear-8Bitdo-Dualshock-Controller-Bluetooth/dp/B01JU57ES6/