This seems like a really good deal. http://www.sonicelectronix.com/item_...nk-VSD-TK.html
You get 20 square feet of butyl deadener for only $45 shipping included.
I got 20 sq ft of Damplifier shipped 4 or 5 years ago for $77
http://www.sonicelectronix.com/item_...nk-VSD-TK.html