Is there any place that sells plastic cases for the PAL Saturn games that came in the cardboard double boxes like Panzer Dragoon Saga, Riven, etc? I just paid out the ass for a PAL Panzer Dragoon Saga and if there's any game I want to keep safe, it's that one.

VGA makes custom acrylic cases at whatever size you want. It's not cheap but it's something to think about. Especially if you've paid a lot for the game anyway