Not seen it posted, so here's a quick tip. It is however rather server dependant.
Requires high level alchemy and enchanting on the same character. All you do is craft yourself a couple of these: Lifebound Alchemist Stone - Item - World of Warcraft
They cost about 700-800g on my server to produce, the maelstrom crystal you will get from disenchanting them, however, sell for about 1600g.
Have at it.