Also posted in the AV section...
I spoke with Rick at RAAMaudio www.raamaudio.com and I wanted to pass the word along to everyone. If you contact him and mention Tacoma World, you will get a discount on his products.
RAAMmat BXT $99/roll
Ensolite Foam 9.95/yard (3 yards per roll of BXT)
Adhesive for foam $6.95/can (1 can per 2.5 - 3 yards)
This seems to be the best product for the money.
I haven't done my truck yet, but this is definitely on my short list (which is surprisingly long) of things to do. I think that my double cab could probably be done for about $500.