Where can i sell my non used lg ks360 ?

Hi im looking at getting a white blackberry curve 8520 and i have so many phones but i want to get rid of my LG KS360 it has never been out of the box ! unwanted birthday gift :( but im sure someone would love it. I am thinking of selling it for about � 40.00 because never been used! please answer my question ! many thanks lotte Miley Cyrus fan!