As of 2015, a factory-unlocked iPhone 3G or 3GS with third-generation technology sells for $50 to $200 depending on the condition of the device and the amount of internal storage. Apple is no longer manufacturing the iPhone 3G or 3GS; therefore, many available devices are used or preowned.
An 8GB iPhone 3GS is available on Amazon.com for $100. Used versions of the same device are available for much cheaper, starting at $40. EBay lists several iPhone 3G and 3GS models for sale for under $100. Some of these models have minor aesthetic damages such as scratches on the casing or screen. On Amazon.com, a 32GB iPhone 3GS is available for $210.