Alright, one more guide and I'll be about tapped out.
BILLFRED'S GUIDE TO EATING OFF CAMPUS
These are my experiences--your mileage may vary.
Beezer's (Go up Greene, make a left at Sumter--Wardlaw College will be at your left. Cross College St., and it's on the left.): The masters of the sub sandwich. You can eat a full meal (sub, chips, drink) for five bucks--but have a couple extra for if you want the Beezer's Freeze (two chocolate chip cookies with ice cream in the middle--mind-blowingly good). They also deliver to the USC part of town if you order at least one sandwich. 771-7771 is their number.
Sandy's Hot Dogs (Go up Greene, make a left on Main, go straight): As the name indicates, it's hot dogs. Good enough for a letter from Ronald Reagan, and they're not afraid to mention it. They also do ice cream which is pretty good. Again, plan on five or six bucks. (And if you happen to get a copy of The State newspaper, they usually include massive sheets of coupons from Sandy's. I'll see what I can find.)
Wendy's (Walk up Greene--can't miss it): Self-explanatory.
Subway (Walk up Greene, cross Assembly, then immediately hang a left. Walk past the Wendy's--it's inside the Shell station): Self-explanatory.
Sonic Drive-In (Walk behind the Coliseum, take the pedestrian bridge over the street towards the Strom Thurmond WFC, then walk along Assembly--be warned, sidewalks don't go the whole way!): Self-explanatory.
That's about all of the fast food places I can think of within walking range of the arena. If I can think of more, I'll post.
(It's so close, I can taste it. Well, maybe I don't want to taste robots.)