Globe Institute of Technology to Northwestern University buses and trains from $101

Here are some trips other travelers have found on Routefriend.
$101
19h 4m
0 stops
Amtrak
$131
23h 7m
3 stops
NJTransit Amtrak
$137
22h 46m
1 stop
Amtrak
$149
22h 15m
2 stops
CoachUSA Amtrak