The foam board I mentioned has foil on one side, kraft paper or similar on the other.
It is typically available at suppliers of home finishing materials, such as siding, roofing, insulation and the like.
I'd forget the big box stores such as Lowes, Home depot. They cater to the home handyman more than the tradesman.
In Canada, there is Kaycan, Gentek, Mitten Vinyl, Monarch, Royal and a bunch more. This is the best source for these kinds of materials, but only if it's the product geared towards renovation siding etc.
The V cuts in your pic work for folds, but difficult to achieve. Using and aluminum brake with gentle clamping pressure will work just fine.
