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a friend of mine used Micro Jute (insulating carpet underlayment)on the floors in his car and an insulating spray foam on the doors. i'd say his was the cheapest i've seen a car done for, but the spray foam is messy as hell.
something else you might want to check out is a product called IceGuard. it's normally used as a roofing material, but is pretty much the same as commercial mats, except for the added asphalt material for water proofing.
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