Baker College of Auburn Hills to Western Michigan University buses and trains from $30

Here are some trips other travelers have found on Routefriend.
$30
3h 46m
0 stops
Amtrak
$31
3h 45m
1 stop
Amtrak Greyhound
$57
6h 55m
2 stops
Amtrak Greyhound
$75
14h 43m
2 stops
Amtrak Greyhound