Okay, Ya'll, these aren't cheep, but they are guaranteed to be the warmest socks you have ever worn.
Buffalo and Cashmere. Buffalo is warmer than wool, and believe it or not the cashmere blended in makes these less expensive.
http://www.paradisefibers.net/Buffal...ks-p/47395.htm

The buffalo fiber is a by-product of the meat industry and the yarn is made here in the good old USA. I honestly don't know if the socks are or not, but I have met the owner of Buffalo Gold and form talking to him I'd bet he found a place in country to make them, but I cna't say for sure.