sound dampening...

['74super]

i read one of the tech articles on this site about sound dampening your interior. i know that dynamat is obviously one of the more dominant companies in this area but i was wondering if there were any others out there. i also know that you can buy sheets of sound dampening material for your home at home depot for much cheaper. would these work in the same way as the ones made specifically for auto use? dynamat is a little on the expensive side...and also when applying it do you aplly the whole sheet or just in little strips. in vw trends they did little strips but in the tech artice he just covered everything with it...thanks for the info.