In regard to Zircar products, they are usually quite pricey.

The Thermal Ceramics BTU-Block Board works out to $13.90 per sq ft for one inch thickness from this website:

http://www.thomasregister.com/olc/Sm...sultstest1.htm

The Zircar Microsil Microporous Insulation works out to over $25.00 per sq ft in one inch thickness from the Zircar website:

http://www.zircarceramics.com/pages/...icroporous.htm