I recently donated some of my papers and books to the Ted Hipple Special Collection at the University of South Florida and had the pleasure of meeting some of the awesome people of make this really amazing collection happen. (That's Joan Kaywell, the spirit and driving force behind the collection.)
They have over 3000 copies of signed YA novels as well as manuscripts, advanced reader copies, various editions, and it's the most used section of the University's special collections. I'm so honored to be part of it!
Check it out here.