Came across this on ebay.
Aspen Aerogel SPACELOFT Insulation Hydrophobic Mat, Per Linear Foot, 57" Wide
$23.75 a foot on a 57" wide roll.
density is 0.15 g cm-3 (2.45 oz/69 g per square foot), which to me seems a bit high. I don't have any frame of reference here, other than an underquilt or pad would take about $100 of materials, and weigh about 40oz if I do the math correctly, assuming roughly 4'x5' under insulation.
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