Globe Institute of Technology to Rensselaer Polytechnic Institute buses and trains from $15

Here are some trips other travelers have found on Routefriend.
$15
3h 15m
0 stops
GotoBus
$20
4h 16m
2 stops
NJTransit GotoBus
$41
2h 19m
0 stops
Amtrak
$65
5h 19m
2 stops
CoachUSA Amtrak