Finally bought a cheap bookcase from target. Might see about buying an extra shelf so there's not the weird spacing. I definitely have enough books to start filling a second shelf. :
4 Cube Decorative Bookshelf White - Room Essentials™ : Target
5 Shelf Bookcase White - Room Essentials™ : Target
Really happy with my new shelves. All set up, these are Target Room Essentials 5 Shelf Bookshelves with additional inserts I made from cutting up a fifth shelf. : r/boutiquebluray
57.5" Extra Storage 5 Tier Folding Metal Shelves With Set Of 4 Deluxe Extension Shelves White - Breighton Home : Target
Xtra Folding 4 Tier Bookshelf White - Breighton Home : Target