How much should I sell my iPhone 4S 16G?

I recently lost my iPhone that I just bought in march, it was taking way too long
to turn up so I just filed a claim with my insurance company, payed a deductible and ordered a new one. Well today the phone turned back up. I obviously don't need two phones so I'm selling it to a friend. Friend's asking for how much and I want to say 100. I still have the box it came in and it's in very good condition.

250 that's a very new phone, and iPhone 4 are still going for 200. But since its a friend I say $225 but $175 atleast.

I sold mine at $200

Sell it online for more!

You can sell it on http://www.cashiphone.com as they have an online quote so you can easily see that they will pay you more than 100. Their service is really quick and shipping is free. I know several people who have used it and the feedback has been great, so they're trustworthy. Think smart.