On a RP server Shirt sell for lots right?
Well next to Stormwind AH is a amour shop the cloth seller in this shop sells Commmon <Coluor> Shirts for like 3s
Now you buy a few of each coulor and sell them at the AH for a 1g Buyout
Note i belive this has been posted before but i added the Stormwind one as it involves a lot less travel (might not be the best scam but works for me)
Hope this Helps yall sure saves time running round for coppers :P