You got may interest so I priced out Aerogel at one internet site and for a mere $250 I can buy a single sheet 4 feet x 30 inches that’s a whopping 6mm thick.
An online search of our local building supply stores do not offer this as a whole house wrap, or in any other manner for a home insulation.
It is not cost effective.
The reason for the high price is twofold. First, it has not yet entered the realm of mass production, enigmatic because of the second reason that the demand for it is sky high.
Theoretically, even if it was being produced in vast quantities, the entire production for years is already ‘sold’, back ordered by government and industry. Commercial public use is far down the priority list.