I won a New Sprint GS8 (black) and I set up a listing on Swappa. The asking price is $550 but that's with the seller fee. Link below.
https://swappa.com/listing/CFQ559/view?ref=mobilenations&data1=UUacUvbUpU6168851
https://swappa.com/listing/CFQ559/view?ref=mobilenations&data1=UUacUvbUpU6168851