There is a quest called "Etherum Secrets"Thottbot World of Warcraft: Quest: Ethereum Secretsin Netherstorm, wich the mobs who you kill are trapped inside prisons, and always drops eather blues or greens ( of the Bear, Whale, etc ) and the questitem you need.
To complete the quest, you need to kill mobs around the prisons for keys;Thottbot World of Warcraft: Ethereum Prison Key ( decent drop chance ), and then you open a prison and a mob spawns, the mob is a little tougher than regular mobs, but easily soloable ( I suggest you get 100% mana and hp ). Then you loot him, and he drops a blue or a green, and the questitem.
But here comes the exploit-part of the quest. If you don't take the quest item, you can just kill more mobs and get more keys, thus getting more greens and blues. Sometimes the blues are BoE and sellable, sometimes their BoP, but you can perhaps use them yourself, otherwise vendor it! The greens are always BoE.
This is what I can contribute with for the moment.