Quote:
Originally Posted by red-beard
McMaster Carr sells all sorts of sound deadening materials.
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Bingo! 
That's exactly the type of answer I was looking for. Thank you so much. I just knew that there had to be some place that sells stuff like this in endless varieties and that was it. And BTW, that place has great phone support with a guy who sounds like he's actually in the U.S. on the other end.
Here's the page:
McMaster-Carr