Price Info on Curtis Doors For The Deluxe Cab?

My XUV 825i has the deluxe cab and doors, but there are times when I wish I had some form of operating windows. I just stumbled across the Curtis aluminum doors with sliding windows which attach with the same pins and latch as the Mauser full glass doors. However, I cannot find any price info on them. The P/N is: 1GXUVFCRDS.

Has anyone seen any prices on these?

Thanks!