samsung wave gs8500 any network swap or cash ?

hi i am sell my samsung it is open to any network its wifi 3g divx hd ,5.0mpix ,hd video, full touch screen app store. there is so much to do on this phone to list in comes in box ready to use im looking for a swap with another phone or the cash . onlt selling as i have had this phone for around 8 mths and would like a change