I've never heard of these people before, but here's a link to their site:
http://www.muze.com/muze-games.htmlThey're the ones who provide eBay with their data. You'll notice a small logo for their company by that game data box on the auction pages. Also, note that they don't list their prices online. They're not exactly targeting the average Joe. They probably mainly sell to large companies, and may base rates on usage. That's just a guess though. If you're really interested, you can always e-mail them for a quote. I doubt it would be in your (or anyone's) price range though.