Cornerstone University to Marygrove College buses and trains from $10

Here are some trips other travelers have found on Routefriend.
$10
3h 19m
0 stops
Greyhound
$25
7h 13m
1 stop
Greyhound Amtrak
$43
5h 9m
1 stop
Amtrak
$43
5h 12m
1 stop
Greyhound Amtrak