For sale is a Bovee Tune2Air model WMA3000.  I used this in my 2013 Countryman.  It will work for Mini models with USB/Aux iPod integration built-in.  I believe that this is most Gen 2 cars.  Please confirm fitment for your car.  I used it primarily for streaming music from Spotify via my iPhone.  I'm sure it has other uses that I didn't explore.

$50 shipped in the lower 48.  PM me if interested in shipping elsewhere.