Aside from the Frostweave cloth, Runecloth is the best selling cloth these days. It is needed for those wanting to get the Ambassador achievement and title. For this achievement, the player needs to reach exalted status from five of his home cities. Runecloth can be turned in exchange for reputation.
Someone must have a monopoly of runecloth in my server. The price of a stack of ten is around 4 to 5gold. I placed what I have for 4gold and farmed for more. Based on my experience, the best farming spot is the Expedition Armory in Hellfire Peninsula. Here you can find Unyielding Footmen, Sorcerers, and Knight that are level 58 to 60. A level 80 of any class can kill these mobs easily.
What’s nice about this spot is that the mobs are lined up for your convenience. It’s like they’re arranged to be farmed. You can start with the Unyielding Footmen in the east. Start from the top and kill them going to the bottom. Then go to the tower and kill the mobs surrounding it. Once you’ve killed the mobs around the tower, the Footmen should have respawned by then.
If you’re farming for Runecloth then stick to the Unyielding Knights and Footmen. The Sorcerers do drop Runecloth as well but not as much as the Knights and Footmen. The Knights charge at the start of the fight. Once you get their HP down to 50%, they would call for help so expect adds to come. The Footmen are much easier. They only have one special skill, which is Shield Bash.
If you have a level 70 toon then this is a good place to level grind as well. Not only will you be able to level your toon but you’ll be farming for WOW gold as well. The only competition you’ll get in this spot would be the lower level characters doing the quest in the area. During my stint in the Expedition Armory, I didn’t encounter anyone from the opposing faction. This is good news especially if you belong in a PVP server.
The gold you get here will not only come from the Runecloths but from the greens that drop as well. There are also vendor trash that you can sell once you get back to town. After an hour of farming, my average haul from the area is around 100g on a bad day.