These are lost media?
From The Lost Media Wiki
I had these as a kid, I believe mine is still in my basement. My local Ollie's has a TON of the characters and like 10 of the starter kits. The next time I go I'll have to buy one. I was playing this last year just for the memories. Edit: Here for anyone curious https://www.amazon.com/Mattel-P9321-Famps-Starter-Kit/dp/B002657FJ6 Edit 2: I do not understand that " no known copies of the game still exist " as you can buy the starter kit online for cheap, and many copies still exist at dead-stock stores like Ollie's. And I still have my original copy from when I was ~6.