I bought an iPhone 4S from eBay.

Back here, you can exchange your iPhone with a minor excuse (3G intermittently working etc.) so the owner of the used phone exchanged it from the vendor for a brand new one at no cost. Therefore, I got a brand new iPhone 4S at the price of an iPhone4 with an Apple Care Protection plan. The only "used" part of the phone are the 19 pin connector, the earphones and the adaptor which personally doesn't quite keep me awake at nights.