How much would i get if i traded in my x-box 360 Elite ?

i also have 2 controllers , Cod5, Fifa 09, GOW2, Cod4, Dark Sector, Farcry 2, Kayne and lynch, NFS Undercover, Gears of war, Fallout 3 GTA IV and mirrors edge wit mic HDMI cables all other cables and a GTA IV Guide Book