Besides watches (Retrograde and Retrotwin), Paul Gerber also makes deskclocks with tourbillon. His site tells us :
“The flying minute Tourbillon is housed in an attractive precious stone casing, which enhances the beauty and elegance of the transparent Tourbillon mechanism. ”
This must be something for the guy who has everything. 🙂 Unfortunately there is no price mentioned, only a few lines of introduction and the specs of this clock.