S.S.
I've bought ours on Amazon. I know you said you didn't really want to go that route, but for us, we found it was the easiest way to really see the whole selection. They have free shipping on orders $25+, so you can buy a couple of CDs and have them shipped free.
Otherwise, I know our library (Anoka-Hennepin) has lots of them. You can look online for the complete selection (since many times just looking on the shelf they're already checked out), request what you want, and then burn them if you like.