Argosy University-Washington D.C. to Barnard College buses and trains from $33

Here are some trips other travelers have found on Routefriend.
$33
4h 25m
1 stop
GotoBus Metro-North
$33
4h 58m
1 stop
GotoBus Metro-North
$33
5h 9m
1 stop
GotoBus Metro-North
$38
5h 19m
1 stop
Vamoose Metro-North