wow thats cheap!
If the Crashes are the original releases (black label) and in good condition they add a bit to the value. I would say that around 50 or 60 is about what i would expect. Sports games don't hold their value at all.
As for finding other games, i would look in the phone book under "Video Games" and then call around to see who carries Playstation games. MGS should be pretty easy to get.. it is around here anyways.