Hi Kip,
Yep, it's at places like Home Depot, Lowes. I got mine at Lowes. I think it was with the insulation products and it comes in rolls.
I got mine to make the "window darkening" panels. I cut panels out to fit in the
windows at night to make it darker in the camper. It's neat stuff and super easy to work with! I just cut it with regular scissors.