$300 · BMW K1600 2017-19 Aeroflow Aero Wings and Mini Wings
http://aeroflowscreens.com/K1600GT_GTL/17On_K1600GT/K160017Accessories.htm
I have the smoked Aerowings which sell for 179.95USD and the smoked Miniwings will sell for 129.95 USD.
Brand new, never installed. Will sell both for $300 CDN.