ERROR: For some reason I cannot get the Digital Press Online Rarity Guide Search Form. The Online Rarity Guide may be down. If it is, then this service is not going to work.
If the Online Rarity Guide is up, please contact user "Slash" on the DigitalPress forums so she can correct this issue.
Expected Rarity Guide Search URL: http://www.digitpress.com/video-game-guide/
As of August 2015, it appears the Digital Press website is blocking requests from this tool, so it will no longer work.