X2 on I-81. Go up I-95 and take the I-495 beltway around DC. Go up to Baltimore and pick up I-695 around Baltimore. Get off I-695 at the I-83 north exit. Take I-83 up to Harrisburg PA and get on I-81. Take I-81 into Scranton PA, then pick up I-84 east. You will by-pass all but 1 toll in Port Jervis NY. It cost me $5.00 to cross in a 40'dp with a car on a tow dolly. If you want you can then take I-84 through CT and right up to I-90 in MA.
The northeast corridor is loaded with toll roads. By going this way you will by-pass all but one toll and its a cheap one. The milage is more but the lack of tolls and better scenery makes up for it. Two years ago the Tappenzee Bridge cost me $25 to cross. Go a little farther north and pay $5 to cross the same river.