Buy cheap used good condition iPhone 4s?

Where can I buy iPhone 4s cheap but still in really good conditon? Unlocked. I think its ridiculous people are trying to sell them for as much as the new iPhones. I need 2. Do you know of a website or anything? Craigslist, eBay, and amazon no good. Still super pricey. Refurbished is fine.

If your Verizon the iPhone4s is FREE

Craigslist $200
don't pay more they are no worth alot anymore.
they are now worth what the 3gs was 2 weeks ago $150-$200