David Courtney Inscribed thus:

Is there any foil-backed extruded polystyrene foam insulation
available
in the US?
I've googled & googled and every link leads to Australia or New
Zealand;
even common product names like "Foamular" only show up with foil "down
under" for some reason. I need about 80 to 100 4' x 8' sheets of 2"
styrofoam with foil on one side, if I can find it.
Any ideas on where to look or what name to search for?

Try "Celotex".

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Best Regards:
Baron.