Hello I was questin the other day in Blade's edge getting my Cenarion expedition rep up and I was on the quest to talk to someone in Blackrock Coven while disguised.
After getting the quest done I walked around the cave somemore talking to the mobs and to my suprise, one of them was a vendor =O. He sells ammo, wood, volatile potions, a cloak with arcane resist, and......an item that turns you into a DRAGON! It costs 2.5g and you can use it anywhere. The only setback, though, is it only has 3 charges and the item is unique =(.
Anyways, I know this isn't an exploit; but tips/tricks would be the best thing for this to fall under imho.