I have a 70 hunter, and at the time I had a 36 warlock (alliance) and I needed MW to up me tailoring
Best place i found (after solo'ing ZF a few times, SM, wastewander, and other sources) were the ogres in southern tanaris. The ones near the very bottom of the map (where they have dunemaul ogres, warlocks, brutes etc). Dropped average 1-3 every kill, very economic. I think the ogres are around 43-45, not too sure on that, but the point is it's nice place to farm.
Lock is level 40 atm with 300 tailoring :D (can't up it til lv50)
~Aiyen on Frostmourne