I have 1 set of the 1667's and 4 sets of the 2000's. I got the 1667 from itxchange.com; the others I got from eBay and it depends how bad you want them-but I wouldn't pay more than $60 each(1), but that's just me. The guy I got them from was very professional; just remember Dave also got a set for a little under $70 shipped! 2 factors exist- there is a slowly dwindling supply or there is huge vast amount somewhere. If the latter exists then they should be real cheap!