Buy neatherweave cloth in stacks of 20 for 2g or less. this means for every stack of 20 cloth you get for 2g, you can sell for 3g. 1g/stack profit selling to NPCs - Buy 1million stacks, make them into bandaids and that's 1mill gold profit. Short, Simple, Easy as pie, and legal!
Make Heavy neatherweave bandages out of it
Sell to merchant for 6g/stack
Make Easy Money With Netherweave Cloth in world of warcraft