I would recommend looking over at sierra trading post. They have loads of icebreaker, smartwool etc. For example I found this one:
It is 39.95, but once or twice a week STP has 'additional 35%-45% off" offers and free shipping deals (you can find these out by going to retailmenot.com, or becoming a subscriber/member of STP).
Things get even cheaper if you get cashback (go to cashbackholic.com and you should be able to get a further 10% off). For that s/s tee the final price with these offers would be
39.95*0.65*0.9=$23.37, which in my opinion is a pretty good deal.