Walmart offers the RCA 55" 4K LED Flat Ultra HD Roku Smart Television, model no. RTRU5527-W, for $349.99 with free shipping. That's $20 under last week's mention, $450 off, and the lowest price we've seen. It features a 3840x2160 (4K, 2160p) native resolution, WiFi, built-in Roku TV (with access to Netflix, Youtube, Hulu Plus, more), and three HDMI inputs.