Ok so heres a tip for some quick gold. On my server i would check the auction house to see if theres any green items level 75-80 that are at a buyout price of 10g or under or a bid price 10g and under. Once i find the items that are 10g and under i would buy them out or place a bid on them depending on how much gold i have at the time. Now the thing is once you get them in your mailbox you dis enchant them. If you not an enchanter tip someone 5g to disenchant 6 items or so. What you get from the green items is any where from 2-7 Infinite dust or 1 greater cosmic essence every time. Once you dis enchant the item wait for either stacks of 5 infinite dust or 20 then sell them on the AH.
On my server a stack of Infinite dust goes any where from 20g up to 50g and one greater cosmic essence can go from 15-20g. So a 100g investment made me 300g in return so i made 200g in about 10min time.
I hope this guide will help you guys.
~Kanora