You may have seen this site-they have an amazing selection of sound deadening material etc. Do a search for whatever you're looking for-they probably will have it! I have used their Dynamat-like material for my custom stereo install in all the doors of my Accord and it is excellent at a fraction of the price of the real thing
I just ordered the same stuff that Ody mentioned above. Haven't yet had a chance to install it since my van doesn't exist yet, but the ordering experience was fantastic from this place. Great turn-around, and the product is exactly what I expected.
-= Darell =-
2002 Ody EXL-Nav (TW) ordered, and now maybe coming on November 2!
2001 Civic EX