Good sources of reflective tarps are: REI; Cabela's both list the tarps as "Sportsman's Blanket and they sell for around $14.00. Reflective on one side, other side is colored, either red or od. I just returned from a trip to Lowe's where I picked up something called "Reflectix", a house insulating material - R 3.7 rated, reflective surface both sides, .3" thick with cotton material between surfaces. I bought a 48" X25' roll (100 sq, ft.) for $45.00, also comes in a 24" X25' roll for $25. Home Depot also carries this, but by online order only. Not all Lowe's carry the 48" stock, so call. I plan on using the Sportsman's blankets for backdrop and roof, covered by Visqueen for front and sides, and use the Reflectix for a "carpet". Still gotta figure out just how to set this up and with a fire lay, as the Cook County (Illinois) FPD frowns on camping and fires, as does my townhouse assoc.