How much could I get for my Wii if I sold it at Game Stop ?

I am trying to sell my Wii and games and gear at Game Stop. But when I called them it seems like they are seriously trying to underpay me for it. I knew most of my games would only go for 25 but the console itself for 15 ? 15 !? I paid 150 and online all systems get a 25 dollar trade in value. The freaking bonus is going to be more than my Wii !? That can't be right can it ? Can some one who knows tell me how much I can look to get ? Accurately ?