Walmart offers the Vizio SmartCast 55" 4K 2160p Flat LED Ultra HD Home Theater Display, model no. E55-E1, for $379 with free shipping. That's the lowest price we could find by $150, although it was a buck less a week ago. (It's also the second-best deal we've seen.) It features a native resolution of 3840x2160 (2160p), Vizio SmartCast technology with integrated Google Cast, USB, and four HDMI inputs.