I'm not sure if it's posted before(I joined MMOwned a few days ago, thus I can't use the search function untill I start contribute, hence this post), but I'd like to share this one.
First of all, you need to be able to create Heavy Netherweave Cloth. Second, you need your server to have a reasonable price of Netherweave Cloth. Then, start looking in AH for stacks of 20x below 3g. Make those into bandages, and you will gain a small profit.
20x Netherweave Cloth = 10 Heavy Netherweave Bandges, 3g at vendor.
So if you buy 10 stacks of Netherweave Cloth for 2.5g, you will get 5 free gold, from vendor! This will of course take time to create the bandages(I recomend crafting bandages while you're browsing the internet, watching tv, etc).
If there aren't cloth in the AH for under 3g, then start writing in trade and make a forum post at your server's official forum. Say that you will buy an unlimited amount of netherweave cloth for 2.5g/stack(or any other desired price) and that they can send it CoD.
This of course depends on the server's economy and if other people on your server knows about this or not. On alliance side on my server, I've managed to buy out stacks for 2g, normally though there are a few at 2.5g, rest above 3g.
Also, if this has been posted before, don't give me any credit.