You might try the Foam Factory; they are easy to deal with, inexpensive, have online ordering, quick turn around and can ship anywhere. They are NOT a typical audiophile-oriented acoustic room treatment supplier. Nevertheless, they are equipped to cut foam for this purpose.
Their main business is in supplying seat cushions for all the Michigan folks who have boats on the nearby lake and cabins "up North". They also do custom mattresses (from "medical memory", visco-elastic foam). They are used to working with custom requests. I'd be willing to bet that even with shipping to Massachusetts, they'd cost you far less than anyone else you might find.
Use your imagination; they'll work with you.
http://www.usafoam.com/acousticfoam/acousticfoam.html
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