Walmart offers the refurbished Vizio D-Series 55" 4K Flat LED Ultra HD Television, model no. D55un-E1, for $289.99. Opt for in-store pickup to avoid the $49.97 shipping charge. That's $108 off list and within $3 of the best price we've ever seen (from two weeks ago). It features a 3840x2160 (4K, 2160p) native resolution, full-array LED backlight, and three HDMI inputs.

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