you wont be far from me!!! im in nh, but ill likely be at my parents camp, which has a commuter rail station 5 mins away(Newburyport)!
There is a place that rents them called Basic Baby Rentals, Inc... but on bouncy seats and swings, if you are going to be there 14 days, it would actually be cheaper to go to a consignment shop pick up a used one, then you could always resell it later on. The bouncy seat rental is $22 a week... might as well buy a brand new one for that. Swings are $40 a week.
heres the site though..
Price List