This is a good topic - Gamestops are filled to the brim with PS3 and 360 games but I just don't see any that stick out as being rare.
If anything, I tried to pick up a few items that were exclusive to the platform, but there aren't too many of those these days.
Culdcept Saga took a little bit of work, but I was able to find that in a local store eventually. I still see Infinite Undiscovery and Lost Odyssey around as well, but I feel like that one might get harder to find down the road, as will a CIB version of Blue Dragon.
A black label copy of Ni No Kuni might even be of worth later down the line, but other than that, I'm usually grasping at straws at the store and just decide to wait it out a bit longer.