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
With these companies, it might be easier than you think to negotiate your monthly bill down.