Were can i sell my SDA9855/alpine stereo?

have an alpine stereo sda9855/alpine which bought back in 2006 which was top of the line its still one of he best stereo out there it also have a glace touch instead of 123... buttons . Its still like new only use it about 4 months still have the original box, remote control and the detachable face little box. If interested please feel free to ask