How Much Would an Apple TV Be Worth?

I have a apple tv I think it's the latest model, it's still in the package with wrapping and all. The thing is I won it during a contest, but I didn't know you were required to have a HD tv or a HDMI port. I think I spelled that right please correct me if I'm wrong, to make a long story short I have no need for it and was considering selling or trading it in, I'm not quite sure what these sell for on the market, but I was wondering if anyone could tell me about how much could I either sell it for or how much could I get by trading it in.