MyWit via eBay offers the refurbished Apple iPhone 6 64GB Smartphone for AT&T (no contract) in Space Gray, Silver, or Gold, model no. a1549, for $399.99 with free shipping. That's $300 under the lowest total price we could find for a new one. (It's also $30 less than our mention from last October of a used one.)

Note: No warranty information is provided.