I have used original Xbox Live codes(found from deals here on CAG!!)and they even worked with my 360 account!!I have have also used MANY expired 360 codes to pad my subcription to XBL.I am set with XBL until Feb.2010 and I didn't pay close to the 50 bucks that most people pay per year for XBL.So...
Use the code " heynow " at checkout and get 20% off your order plus free shipping.All of the items are used.I'm not sure how long the code is valid for.
Werd up