I have not seen it posted here and I was a leecher for a bit and I wanted to contribute...
With the new 4.2 patch they have made a rep vendor in firelands which you can buy epic gear from...
It is server dependent but on my server Maelstrom Crystals go for 400+ gold....the first piece of gear you can buy at Friendly is a cloak and it cost roughly 212 gold and you can DE it...( and sometimes proc for two MC's from one piece of gear)
Nice easy way to make a profit