Tiraxis <The Ethereal Bazaar>
This NPC can be found in Shattrath City (2), Silvermoon City (2), Stormwind City (1), Orgrimmar (1), Thunder Bluff (1), Undercity (1), Darnassus (1), Ironforge (1), Stranglethorn Vale (1), Netherstorm (1), Twisting Nether (1), Dalaran (1) and The Exodar (1).