You can take it to the apple store and get the back replaced. I'm sure that the scratch on the camera lens is not covered under warranty as they say that the scratches done by user is not covered. However, Apple replaces the back glass for just $29.00 + your local tax. It is better to get it fixed at apple so your warranty stays a live. You could go on ebay and buy the back glass but it is likely that it is not an OEM and this can void warranty if your hardware fails on you.