Alliance
Journeyman
Darinna - Darnassus, Craftmen's Terrace
Gretta Finespindle - Ironforge, Great Forge
Randal Worth - Stormwind, The Old Town
Expert
Faldon - Darnassus, Craftmen's Terrace
Fimble Finespindle - Ironforge, Great Forge
Simon Tanner - Stormwind, The Old Town
Artisan
Telonis - Darnassus, Craftmen's Terrace
Master (you have to make a quest to become Artisan)
Peter Galen (Dragonscale) - Azshara, In front of the entrance to The Forlorn Riege
Caryssa Moonhunter (Tribal) - Feralas, Alliance Outpost in the East
Sarah Tanner (Elemental) - Searing Gorge, Alliance Outpost in the SouthEast
Horde
Journeyman
Chaw Stronghide - Mulgore, Bloodhoof Village
Kamari - Orgrimmar, The Drag
Mak - Thunder Bluff, Elevation 2
Shelen Rhobart - Trisfal Glades, SouthEast of Brill on the road to Western Plaguelands
Dan Golthas - Undercity, Rogue's Quarter
Expert
Narv Hidecrafter - Desolace
Karolek - Orgrimmar, The Drag
Brawn - Stranglethorn Vale, Grom'Gol
Tarn - Thunder Bluff, Elevation 2
Arthur Moore - Undercity, Rogue's Quarter
Artisan
Una - Thunderbluff, Elevation 2
Master
Jangdor Swiftrider - Feralas, Camp Mojache
Thorkaf Dragoneye (Dragonscale) - Badlands, in the South, standing alone at the feet of the mountain
Se'Jib (Tribal) - Straglethorn Vale, SouthEast of Grom'Gol
Bumn Winterhoof (Elemental) - Arathi Highlands, in front of Stromgarde, around the road