Iphone 3GS good condition black 8GB swap for anything or money !

Iphone 3GS for sale, a few marks on the back of the phone but not noticeable and is what you would expect from a phone of its age. Works perfect, and is in very good condition. Some marks on the screen but again, theyre not noticeable and you cant see any marks when the phone is on. Available for 140 or any other offers, would prefer to swap the iphone for a blackberry though.. Open to offers.