Giltman is having a great sale on merino wool stuff. Prices start at $20. That is the cheapest I have seen.
This is one of those invite only sites... you can accept my invite to get it... full disclosure: I get a $25 credit if you order under my invite. If you do not want to support my gear addiction, then just go to the regular site to see if you can get in. It usually takes a few weeks to get in if you do not get invited.
http://www.giltman.com/invite/zeroforhire