I used to do (still have to today) karazhan. Full clear with all trash for both rep and gold.

I`m doing this on a paladin with 4 shamans team and a full run gives about 600g. That is slower money then doing gruul or magtheridon for example but unless you have 2 really good geared shamans maggy isn`t going to happen. For a 3man team I really recommand killing whole of kara. It is still great money.

Ohh btw, 600g for just boss/trash gold drops and greys/blue/epic selling. Disenchant greens and there is a lot more money to be gained. My old server used to have ah prices that went through the roof on tbc mats. 120-140g for a stack of arcane dust.