Massdrop offers the 8Bitdo NES30 Pro Bluetooth Game Controller for $27.99 plus $1.50 for shipping. That's $8 under our January mention and the best price we've seen. (Outside of the deal below, it's a low by $2, although most merchants charge $37 or more.) It's compatible with iOS, Android, Mac OS, and Windows. Deal ends May 13.
A close price: Emobilehome via eBay offers it for $29.97 with free shipping.
Note: This item will ship from Massdrop May 27 and will arrive from the eBay seller between May 13 and May 27.