They have this new thing... latest technology... it's called "Craig's List."
Look into it.
BTW, to the founder of RarityGuide.com, I am seldom embarrassed for someone when they try to rate game rarity when they clearly have no clue. As someone who contributed to the abortion that was Video Game Bible, which failed to list some Dreamcast games because those guys had 'never heard of games' like Midway Arcade 2, I have to say your list might very well be the worst since Video Game Bible's N64/Dreamcast sections. Top to bottom, it's so inaccurate, clearly guessworker, uses no hard numbers, and is just overall bad.
I say it out love. But you clearly got into this with no clue.