For a quick, easy fix if there aren't any nearby places where you can get the disc resurfaced I just ended up buying one of those disc swabs from FYE the last time I was there. It cost me $1, I tried it out on a non-working copy of Saturn Bomberman that was a bit dirty and scuffed up and 5 minutes later it was looking lean and filling up my Saturn with satisfying explosions.
Should I get the disc worked on a bit more? Yeah, maybe, but so far so good.