I've got a smoke tinted Touratech Large Touring Windscreen ( https://touratech-usa.com/Store/Large-Touring-Windscreen-BMW-F800GS-F700GSF650GS-Twin-2008-on-TINTED ) - sells for $240 new, asking $150.
I also have a BMW OEM Low Seat for the F800GS, as I've recently added a Seat Concepts Touring seat for my wife's comfort riding 2-up. Asking $200 for the low seat.
I'll be at the 49er Rally, so I can bring either item or both if anyone's interested.