There is something wrong with the camera lens. After having my iphone 4 for only a month, and being in a griffin wallet case since day one, the camera lens had two scratches on it. I couldnt understand how that happened, I babied that phone for nothing else. I was looking into replacing the back as I dropped it over the weekend and the back scratched too (it actually slipped out of the wallet case, which I know realize sucks since it doesnt secure the phone in properly), most places sold OEM backs for about 100 bucks, but it wasnt clear if the camera lens was included.
I finally just went into the apple store, showed them my receipt that i had bought my case on the same day as my phone, and complained about the lens. I also lied a bit and said it was dropping calls in full signal areas. ANyway, the guy was super nice and replaced it for free. I dreaded going in there too, so I dont blame you for looking into buying it, I was almost more willing to spend the 100 bucks than go in the apple store, but money is tight right now so I sucked it up and went in...