Hello this is my first thread on this site so don't go too hard on me(:
I just found out a really good way to earn pretty good amounts of gold by making Sha Crystals (Sha Crystal - Item - World of Warcraft) you can make these, either by disenchanting 476+ epics or by combining 5 Ethereal Shards (Ethereal Shard - Item - World of Warcraft). You get those and Small Ethereal Shard (Small Ethereal Shard - Item - World of Warcraft) by disenchating MOP blues. You can either combine the small shards or make 1 Ethereal Shard by combining 5 Mysterious Essence (Mysterious Essence - Item - World of Warcraft). Lets get to the point here, you can find the Ethereal Shards on the AH for around 50G (Server dependant, I'm on the high populated server Outland - EU). 50 x 5 = 250, which means by buying shards off the AH you can make one Sha Crystal for around 250 gold. These bad boys sells for around 550 gold on my server.
This means that you can make a 300G profit, just by buying the right stuff off the AH. You can find blues even cheaper. Thanks for taking your time to read this, if i did something wrong, do not hesitate to send me a reply
Good luck!