Woot.com. $12.99 for a set of 2, plus $5 shipping.
***Important - one of the beauties of the Woot! site is that you can purchase up to 3 of this deal and still only pay the $5 shipping. If you're looking for a gift for a friend, you could purchase a couple of these along with some drink mixes, and jump up the "coolness" scale awfully quick. :)
Link to Deal Click Here