Lower cost carpet options???

RedFish said

The moulded carpet with insulation on it doesn't roll up very well and is quite heavy, thus the high cost of shipping. I put Trim Parts carpet in my 67. No complaints.
If you do decide to use some other floor covering... please ensure its fit and secure attachment near the accelarator pedal.

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Yeah, I don't want to go all Toyota Camry like with a stuck pedal.
What I have isn't quite traditional indoor/outdoor stiff carpet, it's about an 1/8 inch thick and fairly soft.
I would still really need some kind of pad or underlayment beneath. I mean, it's pretty loud without it. I have a cousin that has loads of new house carpet pad???
Anybody ever use traditional undercoat to seal up a floor? I see the soundproof stuff in a can and and sound deadening mats but they are pricey.
Thanks for all the help guys.....