Find a retail location selling Amazon Gift cards http://www.amazon.com/gp/feature.html?docId=1000465651
Buy a physical Card with CASH only and save a copy of the receipt.
Take a picture of the back of the Amazon with the code scratched off and the Receipt showing it was bought with CASH. Picture must be high RES and clear.
Type in the code on the back in the Trade chat and click Payment Complete.
Wait for the seller to release bitcoins. ATTENTION if you have online code only, i will accept it if you have +100 REP