How to protect the iPhone 4S camera lens

hey I just bought a new iPhone 4S and it takes pretty amazing photos. Now I'm fearful of the fact that the camera lens may get scratches, smudges et etera so could you suggest me any protective cases which also covers the camera with a transparent glass/plastic. That same case too should protect the screen. I've tried the otterbox defender. While it does a pretty good job of protecting the phone's screen and the phone overall but it leaves the camera unprotected. Or should I jusy buy those sticky plastic things(the thin clear transparent film) that I'll put on the camera lens and replace it once a month or could you suggest me a case which both protects the screen and the camera. Just another thing that the case should rotect it from ordinary drops. Thanks in advance for the help. 🙂 I really appreciate it.