Walmart offers the refurbished Samsung 55" 4K 2160p WiFi LED-Backlit LCD Ultra HD Smart Television, model no. UN55HU6950F, for $879.99 with free shipping. That's tied with our mention of a refurb from last week and the lowest total price we've seen. (It's also $159 under the best price we could find for a new one.) It features a 3840x2160 (2160p) native resolution, WiFi, Internet apps, USB, and four HDMI inputs.
Note: No warranty information is provided.