Walmart offers the refurbished TCL 50" 4K 2160p LED-Backlit LCD Smart Roku HD Television, model no. 50UP120, for $263.86 with free shipping. That's the lowest price we could find by $116. Features include a 3840x2160 (2160p, 4K) native resolution, WiFi, Roku Smart TV (with Netflix, Amazon Video, Hulu Plus, and more), USB, and four HDMI inputs.

A 90-day warranty applies, but it's unclear who backs it.