Been thinking about this for a while. VGchartz needs a retro thread. This is a great start. It will take me a while to put together my list in full glory so I'm tagging the thread until I can post them.
A question I have is where did you get your Price Ranges from? I currently use https://www.pricecharting.com/ to find the value of games.
Short quick list of my rare games off hand (>$100):
Name - Loose Price - CIB Price
SNES:
Chrono Trigger - $102.50 - $219.95
Playstation 1:
Valkyrie Profile - $122.50 - $144.25