Actually, haven taken the bus to Atlanta from Charleston for DC 2 years ago, you do NOT book each part of your trip seperately. You'll have a couple transfers, but you don't book them seperately, they are all included on one ticket. I have just checked it actually. And if you buy your ticket now, the 7 day advance fair is $78 roundtrip ($93 after taxes and fees).

I am coming from Charleston myself.....if we had room in the car, I'd offer you a spot...but with 4 people, costumes, merchandise for an exhibition table, and luggage...well, we're not even sure how we're getting all of us in there.