Amazon has the 8Bitdo Bluetooth SNES Retro Receiver for $16.99 with free shipping for Prime members or in orders over $25. Regularly over $25, this is the Amazon all-time low and the best price we can find. Rated 4+ stars on Amazon.
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These are great for adding wireless control over your vintage consoles as well both the original controllers and modern options. Much like the NES Classic Edition version, 8Bitdo also makes wireless receivers for the original NES that go for around $25 Prime shipped or so.
8Bitdo Bluetooth SNES Retro Receiver:
Just like the Retro Receiver for NES, we partnered with Analogue to develop a wireless experience for your original Super Nintendo and Super Famicom. The Retro Receiver is a bluetooth receiver that you plug into your original SNES. It allows you to play your SNES wirelessly with any original SNES or SFC model and even other aftermarket SNES/SFC systems.