How to buy an iPhone 5 for $400?

I want to buy a like new GSM iphone 5 for $400 that has no defects or scratches but has been used by someone else. But I can't seem to find one at that price.

Ebay has great deals on used iPhones! You can bid on one at the last second and get one for pretty cheap. Just go to ebay and see what you can find. Hope this helped