Eternal Earth
Crystallized Earth is on the more common end of things, and one of the better farming spots is in a place you should be questing anyway for the Sons of Hodir. Convenient!

Wintergrasp. You know the drill.
Brittle Revenants spawn at Frostfield Lake in Storm Peaks, right behind Dun Niffelem. One of your Sons of Hodir dailies has you killing these, so you might as well get both at once!
Lifeblood Elementals in Sholazar Basin swarm around the Lifeblood Pillar, and while their droprate is a little lower than most of the things listed so far, they're very easily farmed. There are quite a few of them, and they'll be a few levels under you so you'll probably be able to round up a bunch at once safely.
And that's about it. Make sure you check out our very handy maps in the gallery attached to this post to see exactly which areas I'm referring to, and so you have an idea of where you should go within Wintergrasp to get what you're looking for. Remember, these elementals are only in Wintergrasp when your faction owns the zone!

buy wow gold,cheap wow gold,wow gold,cheapest wow gold,warhammer gold,warhammer powerleveling,war gold,war powerleveling,war power leveling,buy ms mesos

references:

http://myhappyblog.com/index.php?do=/public/user/blogs/view/name_wowgame/id_1466/title_ghostcrawler-announces-mage-changes-for-next/

http://www.bloxster.net/wowgame/51971/seven+of+them+at+Heroic+difficulty.html  http://www.bloxster.net/wowgame/51973/Bad+business.html