How much is my 16 gb white iPhone 4S worth?

I bought my iPhone in June. I decided I'm not to crazy about apple and want to go back to androids. My iPhone 4S is a 16 gb. It is in brand new condition, no cracks or scratches because I have used screen protecters and an otter-box case. I'm wondering how much I could ask for it. I don't want to trade it in, I want to sell. I already bought my new phone.

I believe eBay at one point was offering a calculator that gave you the amount that they would buy your phones from you. However, you'd probably get more money selling it on CraigsList.

I believe an iPhone 4s 16G in good condition can retail for as much as $200.It some what varies now that we have the iPhone 5, 5c, and 5s's floating around.