What are you most proud of in your apple ii collection (hardware and software)? What are your "holy grails"?

I have the complete Microzine collection by Scholastic. It took me at least 10 years to find the last title.

I also have most of the other Apple II titles by Scholastic (ie Agent USA, Quations, Tales of Mystery, etc)

I would love to get all the Microzine Jr titles as well as the complete Scholastic collection, which may be impossible as I'm not sure all the titles exist in boxed form anymore

I'd also love to get Prince of Persia. The only avaiable title on Ebay is listed at $2000, which is silly. I'm shocked that such a wide release game is so rare in the wild, like why is Summer Games so much easier to find than Prince of Persia?