Just before I left on a red-eye to EWR, I figured out different scenarios as to how I can get between EWR and Parsippany and back. The two cheapest ways were:

1. SuperShuttle shared van, RT $61.
2. NJ Transit, EWR Airlink to Morris Plains Station, $16.75, Livery cab from Morris Plains Station to my destination in Parsippany, $10.00 negotiated. RT $53.50.

I did #2 just for the scenery, btw. Up until that day, I never ever experienced an Amtrak Acela roar past me full speed on track 5 in the Upper Seacaucus Junction station!