I used a self adhesive rubberized product known as "quick roof" on projects in the past. Same idea as dynamat and includes a foil layer that "shows" under the carpet, door panels, etc. It's much cheaper that alternatives and does a great job of deadening the "tin" sound on panels. Then you can cover it with foil backed jute padding for insulation and be set for half the cost of actual dynamat or alternatives.
Here is a link for buying it:
At Lowes At Home Depot 
