As user Brendio guessed it is Grass Hill Alpacas. Check out the deal here:
http://www.metaco.in/deals/alpaca-socks/Brendio, please PM with the username of the account you used to sign up for the newsletter or message me through Twitter with the account you followed us on.
Pity I already bought Alpaca socks from them last week. Maybe I should stock up on another pair?