U can google gamestop trades n when u click on the link, it will tell u how much they will give u for it.
It really all depends on quality and condition of system as well as anything u are going to bundle with it. Sometimes their website has a list of prices they are offering for items if you can find your local stores website.
I believe it depends on the age & condition of the system. You can call and they'll give you an estimate.
Thanks! Your answer is awaiting moderation.