A few nights ago, I slept down into the mid-high 30's on top of an original Neoair (r-value 2.4) on top of a car window shade in a tent and inside of my REI Radiant sleeping bag (comfort rating of 32), and I was still cold. I've got one of those blue CCF pads, and I was thinking of getting some more of them, but I read they're only rated to an r-value of 1.4. As cold as I sleep, I'm thinking I need to sleep on something rated to around 5ish, but I'd need to stack four of the blue pads under me to get that! I'm not even going to talk about the unacceptable amount of bulk. For the price of four blue pads, I might as well get one of those REI branded self-inflating pads. They weigh 2 1/2 pounds, but us poor folk can't be too choosey. That's not my main concern though; it's price. Does anyone know of something more economical?

I'm open to untraditional ideas. There was a guy online who made is own pad from carpet foam, but it ended up being over nine pounds!