I just have loose Silent Hill & Silent Hill 2 (PSone/PS2 respectively) and got them a few months back for $1 each and been trying to buy their cases/manuals but with no luck so far. I can usually find them sitting on the shelves of game stores but they cost more than it would to just find the cases. Since they sometimes go a few months unseen I'd say it's a harder to find common game around here.