In Stormwind there is an easy way to make some quick, cheap money, with little effort on your part.
If you go visit Lisbeth Schneider in the clothier shop in the trade district behind the AH (like less than 100 yards from the AH), she sells the Stylish Black Shirt for 60s. Usually on my server's AH these go for anywhere between 5-10g each on the AH, since most people don't know where they are bought.
This is an alliance side only shirt, so it would be an assumption we could make more money if we sold them on the neutral AH to the horde.
Just quick, easy money, with little to no investment on your part.