I really like the Heritage Permanent Auction Archives for research and a "real world" price guide. Is there anything even close?
As comprehensive as them ? Not even close. But just about all of the major auction houses keep records on realized prices and most of them are available on-line. But they aren't set up like the Heritage database and searching through is quite time consuming. Teletrade would be the next closest to Heritage.
Nope. When I'm trying to figure out what a far price for a certain coin is, the Heritage website is my #1 "price guide".