What type of insulation are you wanting to buy from them?
Closed cell spray foam directly onto the bottom of the metal is the best. Never use open cell, it holds moisture and over time it rusts out the metal from the foam touching it.
Bubble wrap and those types of insulation deteriorate over the years. Probably from the extreme heat off of the metal.
If a flat ceiling is possible, my favorite, best bang for you dollar, is to use blown in insulation 2 feet thick. Atticat is by far my favorite. Then the air coming in from the eaves and leaving through a ridge vent will keep the metal dry so condensation is never an issue, and the space below the ceiling is always very comfortable.