When you're exalted w/ Cenarion Expedition, you can buy the Flask of Distilled Wisdom Recipe from Fedryen Swiftspear in Zangarmarsh.

This costs only a few gold (4) and is NOT BOP!

However, it does require you to be CE Exalted to learn it - but most people don't understand that.

So you can buy a few of these for a few gold and resell them for up to 100g depending on your server.

There's several good aoe spots in the outlands(you can't have mine lol):p It basically takes a team of 2. It could be done if you are an sl lock but just not worth the time. I've powerleveled and farmed with basically every class with this ONE warlock spell. Just have your buddy round up a bunch of mobs and hold them in place while u toss out 5-6 seeds out.