Walmart offers the refurbished Samsung 49.5" 4K 2160p LED-Backlit LCD Ultra HD Smart Television, model no. UN50KU630DFXZA, for $379.99. Opt for in-store pickup to cut that to $371.25. That's $329 under the lowest price we could find for it new. It features a 3840x2160 (4K, 2160p) native resolution, 4K upscaling, built-in WiFi, Bluetooth, Smart Hub (with access to Netflix, Pandora, Hulu, etc.), USB, and three HDMI inputs.
A 90-day warranty applies, but it is unclear who backs it.