I have 21 1/2 sheets of Damplifier Pro. That's 35.8 ft/sq of the best sound deadener money can buy. My project didn't use as much as I thought, so I have a bunch left over.
Price is $125 shipped CONUS (this stuff is heavy!).
I also have a single sheet (9 ft/sq) of Luxury Liner. I'll sell it for $25 shipped or $20 if you buy it along with the Damplifier Pro.