I have an announcement to make: due to a huge interest in this from the community, we've decided to launch the Commodore 64 Rarity List / Price List sooner then what was planned. The original plan was to first finish the Game Boy Color and Game Boy Advance Rarity Guides, but we are now giving priority to the Commodore 64 games Rarity Guide.
The guide will be launched shortly and will be populated with data as we process it. It will take a lot of time to complete (since there are thousands of titles) but we will make all game data available as we analyze it. As a reminder, at RarityGuide.com we manually research all the data and do not post harvested numbers. You should see the Commodore 64 Rarity guide up with some games listed soon, and as we study the data more games will be added slowly but surely until it is complete.