Cabelas has 4-packs of their branded wool blend socks on sale yesterday and today for $9.99 with free shipping (code 7HOLIDAY). Regular price is $19.99 each.
Both medium weight and light weight are available in various sizes.
I haven't tried them yet, but the socks get good reviews on Cabelas' site and carry a lifetime guarantee. I ordered two packs last weekend at $12.99 each and haven't gotten them yet, but I did call customer service and they said they'd credit me back the price difference.