Anyone know where I can get some and how much it would cost to cover the TA

 

it's dynamat not Dyno Matt.

http://www.fatmat.com/ is a reputable place to get it from.

Cost all depends on how much you want to do/cover.

Personally... I used a generic version (not name brand) and it sucked; I ended up removing it all. I then used foam weatherstripping between all the panels to eliminate the rattles; and 3M Ruberized undercoating to coat everything. Worked awesome. It requires a LOT more prep work as you MUST mask everything off that you don't want coated.

 

which foam weatherstripping? frost king?

 

For sound deadening I'd look at RAAMmat or if you budget permits Second Skin.
80 sq.ft. and up will either be enough, or finish a large portion of it
PM sent.

 

Yup, just the stuff you get at Lowes/Home Depot. Works the best for eliminating panel to panel rattles which is where 80% of the annoying sounds come from.