best place to purchase insulation?

[bigblock73]

I am looking for the best place to buy some Dynamat and factory sound deadening. Does anyone have any good (and inexpensive) sources for these two items? I see Summit and Jegs have it (dynamat), but i am hoping there are cheaper places as well. Also looking to find good quality factory stuff as well.

I am going to install one layer of the thin Dynamat with the factory sound deadening over it...does this sound like a good idea? What has everyone else done?

Thanks - Jeff