8BitDo is now selling a Bluetooth receiver for the Sega Saturn for $25. They're claiming "Virtually Lag Free", but as usual they don't post any actual measurements. If you're willing to spend an extra $10, you can get one based off of BlueRetro that's been measured with low-latency BT controllers
That’s some sweet 1978 Battlestar Galactica typeface on the pictured keyboard.