RefurbforLess via eBay offers the refurbished Vizio 57.5" 4K 2160p LED-Backlit LCD Ultra HD Smart Television, model no. D58U-D3, for $439 with free shipping. That's $10 under our mention from two weeks ago, $361 off list, and the lowest price we've seen. It features a 3840x2160 (2160p) native resolution, Vizio Internet Apps Plus (including Hulu, Netflix, YouTube, more), and five HDMI inputs.
A 90-day warranty applies, although it's not clear who backs it.