Netherweave Cloth

This drops everywhere in Outland, on most servers it fluctuates between 4g and 10g, a good time to consider selling this on any server is between 7-8g, it might not be the best price you could get for it, but you wont lose precious gold in auction house deposits. Since it drops almost anywhere you will be able to get very big stacks of it, and when sold for 7-8g per stack will surely make you earn great amounts of gold.

Everyone needs Netherweave Cloth, there is much demand for it, so you can nearly always sell this in the trade channel or the auction house. To pick up great amount of Netherweave Cloth I suggest killing the Trolls in the Warmaul Compound in North West Nagrand. There are plenty of mobs to kill and you generally get 1-3 pieces of netherweave per kill. Aside form killing these trolls you will also get some Warmaul Beads, which are excellent for getting your rep up with both Kurenai and the Consortium.

Stick to this areafor awhile and just grind, you will see your gold amount increase incredibly.