MobilePros1 via eBay offers the refurbished Unlocked Apple iPhone 5S 64GB Smartphone for GSM Networks in Space Grey or Silver for $399.99 with free shipping. That's $230 under our August mention of a refurb and the lowest total price we've seen for this model. (It's also a current low for a refurb by $300.) Deal ends December 9 at 11 am ET.
Note: No warranty information is provided.