And I do mean quick, because these prices likely won't stay this way for long. MBAzeroth points to a forum guide written up by Fanfan on the Mal'Ganis realm forums (that link, strangely enough, doesn't work-- did Blizzard take it down or move the thread somewhere else?) which he says netted him a shiny 1,000g in just two hours.
All of it relies on the Primal motes of Air, Fire, Water, Mana, and Earth-- those mots can be combines to make the Primal elements used in all kinds of professions, from Leatherworking to Tailoring and Enchanting. Since everyone is currently working on making their way to 375, sales of this stuff are huge on the AH, and with droprates the way they are, you can net a pretty penny with just a few hours of grinding in these places. Of course that means the more people that find out about this (and the more people that finish their profession leveling), the less it will be worth. But if you get moving on this in time for the weekend AH rush, you could likely make a good headstart on your epic flying mount.
The entire guide after the jump.