cheapest 20th ann reverse proof
 

I got the regular proof, I got the 06-W MS, now I wonder if I can pick up a reverse proof, the expensive key to the set. who's the cheapest vendor? I see a bunch on ebay right now but they're auctions not due to close for a while.

also-- how do you track history of auctions on an item like this on ebay? can you do that without some kind of enhanced account?

Re: cheapest 20th ann reverse proof
 

Just check "closed auctions" on the search options. You need to have an account and log in to do that, but nothing special that I know of. From what I know about the 20th anniversary sets, eBay is the cheapest place to get them.