I think that they are $500 from Kaplan, BUT you can buy them almost anywhere for less. There was a post that one guy was selling them for $250. Just make sure that when they say "Brand New", it means the 7 book set, not the 3. Ebay is a great spot, it's where I got mine!
This forum is for support and discussion only. Please promote test prep materials/services (including AMAs) in the Student Assistance Subforums. Thanks!