A little kitty alerted me to a sweet deal at BCO. They have the Merrell Merino T-shirt in blue for $17.50, which is a great price for a merino t-shirt. I have never owned any Merrell merino, but they make high quality stuff in the rest of their line, so I would imagine that their merino would be the same.
850 left as of this post, and no quantity limits like SAC, so stock up! I’ll probably buy around 10.
Edit: Be sure to read the discussion in the forums, since there are some questions about the quality of the shirt.