I've found that pawn shops tend to be fairly crappy resources for games... usually these places don't have anything good, what they do have is overpriced, and the people who work there are amoung the most shady people you will meet in retail (if you consider pawn shops to be legitimate retail)
however, I was drving by a place where I once got a few decent Saturn games a few years back, so I pulled in. They have had crap since then, but one never knows. I looked at the glass display full of overpriced PS2 games and loose N64 carts and was about to give up when I saw something jammed into a corner of the case... a complete Keio Flying Squadron for the Sega CD! It's a cool little shooter that's evidently pretty hard to find. And it was only $10!!! Perfect condition! You could shrink wrap it and you'd think it was new.
That being said, pawn shops still suck.