Where can I sell an iPhone for cash?

I recently ended my contract with sprint and I want to sell my iPhone for at least $100. I won't do it unless I can at least get $100. I really don't want to sell it on craigslist and deal with sketchy people. I don't want to do gazell or any online thing mainly cuz I don't trust it. I want to do it in person like a store. I tried going to best buy and Walmart, but they would only give me $13-$30. Its in perfect condition, no scratches, no dings. It looks brand new. I have the charger and original box and it works perfectly.

Added (1). Its an iPhone 4S 8gb

Added (2). I tried selling it to a friend, but it is locked to sprints service and nobody wants it because its sprint. I hate sprint and everybody I know don't like sprint. I really don't get this whole locked thing

Added (3). the phones not stolen, I bought it from sprint, and I did a factory restore on the phone so it is like new.

Added (4). I also got a new phone from metro pcs

Ebay.com You could sell it for 120$ fast

With stolen phones and identities to worry about in the marketplace and with all your personal data inside the phone, do some research to protect yourself before you sell that phone. Maybe keep it for an emergency phone as they all can dial 911 without a subscription.

Post a for sale ad, at school, at work, maybe at your local food market. If you can sell it on-line, then use eBay.

Craigslist