You will need:A horde char at booty bay, ur main as alliance, your main in booty bay, and the ability to make another character.
1. Make a Blood Elf
2. Send him some money from one of your horde alts
2. Buy as much unadorned armor as you can from the vender in the Blood Elf Island
3. Send the armor to your horde char in booty bay
4. Put the unadorned in as 1s in the AH to buy on your ally char
5. Buy the armor and sell it in your factions AH for 5g each!
Note: In my server each piece sells for 5g in like 1 day so its easy to make a quick 75g or 50g