What's the cheapest place to get a iPhone online?

I'm looking for a iPhone with IOS7… So yeah I'm looking for the cheapest place online to get a iPhone for like $100-$200. I would like for it to be unlocked. No cracked please! Please help me find a place to get a iPhone 4S or 5s. Thank you for the help that you give me! Or trying.

The cheapest you are gonna get is a used, old one. Go to Ebay.

Try eBay. Wouldn't be a 4s or 5s for that price range though.