Wheelers makes US style Ranger Blankets, and I'll bet you could pick up the issued ones at surplus stores.
I was issued a CADPAT Ranger Blanket last month when I turned in my sleeping bag liner, US Ranger Blanket, and Poncho. The CADPAT Blanket (I think the official name is the "sleeping bag liner") is a pretty cool piece of kit. It is made of the same material as the US Ranger Blanket, has a zipper on the edges to make a sleeping bag, and a semicircle shaped zipper in the center to put your head through and wear it like a poncho.I just got back from a week long field ex and slept quite comfortably with just the CADPAT blanket zipped up like a sleeping bag inside my Bivy Bag. I'm not sure if you could pick this one up at surplus stores yet, but in my opinion its quite the improvement over the US Ranger Blanket.