I have tons of lithographs, prints, and original artwork that I gave up on framing and just went with a different option to protect them. What I did find for the smaller pieces was itoya art portfolios, which allow me to protect them and also flip through them. It was about $20 for a 24 page (48 w/ back front) 14 X 19 Itoya art portfolio binder from Dick Blick. It was perfect for the smaller lithographs/prints and all the original artwork I had from comic book artists. Then I purchases a zip up portfoilio to protect the larger pieces up to 28 X 36 although this was for protection only and doesn't allow display.