Hey all,
here's a little money-making trick i recently thought up. It's a bit of common sense but maybe not everyone has thought of it yet.
Go to AH, look for helms (make sure you dont look for class-specific helms). Personally i fill in '16% GF' and 'has sockets' as criteria.
I just look very fast at every item to check if theres a gem in it or not. If it does not contain a gem or a really crappy one, buy it and put in a 19 or 21% emerald and resell for alot more. This can ofcourse also be done for MF helms.
As alot of people dont know that GF is worth something, they post the helms on the AH for different reasons than the goldfind and put in a different gem or no gem and sell them cheap. These are the helms you are looking for ^^.
Already made a few million with this, good luck!