Walmart offers the refurbished Vizio SmartCast 55" 4K Flat LED Ultra HD Home Theater Display, model no. E55-E1, for $309.99. Opt for in-store pickup to dodge the $19.97 shipping fee. That's $30 under our July mention, $56 off, and the lowest price we've seen. It features a native resolution of 3840x2160 (4K), Vizio SmartCast technology with integrated Google Cast, and four HDMI inputs.
Note: A 90-day warranty is included, but it's unclear who backs it.
Uncle Sam could take a hefty chunk of your retirement income if you botch this.