Friend just sent me this link:
http://home.att.net/~cleardomesolar/solarflex.html
QuoteWe're finished testing our hottest, newest product, SolaReflex reflective panels with a bonded, patented SolaReflex metallic surface and an invisible protective top coating for better scratch and salt air resistance, with a minimum 7-8 year life. The ABS panels come with two different sides, diffused and near-mirror surfaces. The smoother polycarbonate panels have two mirror surfaces. Our SolaReflex 900 degree Parabolic cookers are over 300 degrees hotter than the 600 because of this patented super reflective surface!
And it's easy to order--from Amazon, no free shipping (I guess) but the company has a 3
1/
2 star customer satisfaction rating.
They also make a black absorber that might be useful in one of those barn--or house--heater/vent things.