I got mine from Discount Jungle.
After I upgraded my audio I bought 2 boxes of the original door-kits and 1 box of the Xtreme door kit. I didn't apply entire sheets to fully cover areas, instead I selectively applied it around the speaker mounts, generously around the rear compartment area including behind the plastic trim (where my 8" JDbox resides), and patches where I thought needed dampening.
I only ended up using just one box of the original stuff plus one sheet from the next original kit. I never touched the better Xtreme stuff. Had I known I was only going to use so much, I would've applied the Xtreme stuff first which looks and feels superior to the original stuff.
The before and after difference was "just okay" with the original Dynamat. Sometimes I wonder if there would've been a huge difference had I used the Xtreme stuff. Maybe one day I'll reapply the stuff. Anyway, good luck and here's the link:
