American University to Clark Atlanta University buses and trains from $13

Here are some trips other travelers have found on Routefriend.
$13
13h 0m
0 stops
Megabus
$55
15h 34m
1 stop
Amtrak Megabus
$55
15h 34m
1 stop
Amtrak Megabus
$83
19h 49m
1 stop
Amtrak Megabus