The search is a little clumsy, but I was able to search popular authors (Karen Katz, Eric Hill, Ezra Jack Keats, Seuss, etc.) pretty easily. We purchased I Spy books, two Max and Ruby books by Rosemary Wells, a Karen Katz lift the flap and a copy of Charlie and the Chocolate Factory. Books may be marked used, and may have shelf wear. I will let you know how it goes!
I love Amazon, but this may be a worthwhile alternative.