I used that stuff in my truck too, I got it from Jeg's. I came in a big roll, with the foil on one side.
I put it on the firewall, above headliner, on rear cab behind seat and I'm gonna put it under the seat when I'm ready for that.
It was something like $25 for a big roll, it turned out I needed about 1 1/2 rolls to do everything.
That spray on glue worked real well too, you have to apply it to BOTH surfaces though.