So i did a gamble. I bought about 100 jeweler's settings at the orgrimmar JC vendor. i posted them on the AH for a little under 30G. after 2 days, about 80 of them were sold. my profit:
(28G1S (price after fee deduction) - 1G20S)X80 = 2144G for less than 5 minutes of work.
are there any other items that i can make such a turnover with?