Sorry to burst your bubble, but the method has been patched.
You can no longer purchase any Codes.
Edit: You can purchase codes, but for far more expensive then before.
But someone has a thread here with 200 kreds for 5$ and he agreed to a 32000 gold for 40$ deal (hes only accepting btc so i cant buy from him). So even though you cant purchase codes cheap. You can still get them cheap from a reseller.