Walmart offers the refurbished Unlocked Apple iPhone 6s 16GB GSM Smartphone in Space Gray, Silver, or Rose Gold, for $499.99 with free shipping. That's $120 under our mention of a new unit from last month and the lowest total price we've seen for this phone unlocked in any condition. (It's also $149 under the best price we could find for a new unit.)

Walmart also offers the refurbished Unlocked Apple iPhone 6s 64GB GSM Smartphone in four colors for $549 with free shipping. That's the lowest total price we've seen for this model unlocked in any condition. (It's a current low by $200.)

Of note, no warranty information is provided.