Someone sell me their iPhone.please! 4s?

I'd buy $250 or cheaper. Please please, I prefer factory unlocked iPhone 4s.

Pop over to Craigslist - probably lots of options, especially at that price point.

You're at the wrong site. Go look at eBay.com or Craigslist.org. Another site that sells lots of used phones is cowboom.com; I've bought a used iPad and a used iPod touch and I was happy with them, they're actually owned by Best Buy.

P.S. Craigslist is more likely to be scammy or have people selling stolen stuff. Pay attention to the warnings that the site shows about buying safely.