You can find the generic stuff from McMaster Carr. Under their acoustical damping. Its pretty much the same thing as Dynomat both are asphalt based. Its a little thiner .070 compared to dynomats .075 but it does weigh less .4 lbs per square inch compared to dynomats .66 lbs per square inch. Works well and is way cheaper. If i remember correctly i paid $17 for a 36"x40" sheet. If you want a part number i could look it up.