Always plenty on ebay, I bought a new Mono seat from a 996R, complete with all hardware/lights etc last year from a guy that had put his bike on the track and never used any fairing parts - I can swap seats in minutes.
There are also aftermarket (often CF) seats available but I would imagine buying one from Ducati would be very expensive.
There are also aftermarket (often CF) seats available but I would imagine buying one from Ducati would be very expensive.