Thought I saw someone selling a used one in this forum. Try lelong, there's a guy who sell parts. If you're lucky, can probably get a good used one (= cheap).
http://www.zerotohundred.com/?attachment_id=15339
As the Pagani Zonda reaches the end of its line, it seems natural that the supercar maker would be churning out a slew of one-off variants before it finally bows to...