In Europe, these cases are standard. I have a few mates in GameStop, and they know I collect, so they give me all the spare case's they have. The vast majority of them are actually decent, so with a bit of window cleaner and elbow grease, they can be nearly as good as new.
If you live in Europe, you can try what I do.

If you already have some, and end up with prints that are a to small, let me know. I used to have a problem with them, but I figured it out. I use paint to print them now.