Originally Posted by
Elementalkin
The Quartermasters are in Stormwind and Orgrimmar.
Edit: I'm not sure where the Alliance one is specifically, just look around that area carefully. The Horde one is slightly off to the side of their little set up in the Valley of Honor.
Second Edit: Okay, the quartermaster is 'Old Whitenose' at the Pandaren area in Stormwind. Neither the horde or alliance quartermasters sell the turtles yet, at least they don't appear for me (but neither of my toons have exalted rep, so).
Third and Final Edit: OLD WHITENOSE*.