I bought a knockoff-
Pacific outdoor bomber cadi
$65 and 99cents shipping. 3" thick, super tough. I have about 30 nights on it and it still feels brand new.
I'm happy. my only complaint is that you have to watch the valves in the sand and since I rarely set up a tent this is all the time. basically you have to set it down instead of throwing it down vavles forst. No big deal.
The material is nice, just a little textured, and has a dark and a light side. I strap it on my drybox/seat and depending on the weather turn a different side up.
If it wsa a 4 inch Paco I would not be able to use it like this on my box.
I'm very happy. I even take it on what most would consider ultralight trips as my one luxury item.