It is at the rear of an aisle, adjacent to where the batt insulation is displayed in our HD. There are also rolls of foil and specialized insulation in that area. They have rolls sized to fit between 16" and 24" studs and also 4' wide rolls. I also found it at Furr's and in my favorite hardware store.
The insulation is about 1/4" thick. There is a plastic film under the foil on both sides, so it is quite strong. It does stretch nicely around curves like the interior of the Scamp.
I'm tempted to do the International the way I did the Scamp.
John W. Irwin
2005 Classic 28 "Sabre-Dog III"
2013 Silverado 2500HD Duramax/Allison LTZ
WBCCI #9632, TAC TX-10