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 $450 off and tied with our mention from a month ago as the lowest price we could find. It features:
3840x2160 (4K) native resolution
built-in Roku TV (with access to Netflix, Youtube, Hulu Plus, more)
three HDMI inputs
These extended free trials offer a wide variety of shows.