Walmart offers the RCA Virtuoso 70" 4K Flat LED Ultra HD Smart Television, model no. RNSMU7036, for $599.99 with free shipping. That's $700 off list and the lowest price we could find, although it was $50 less ten days ago. Features include:

3840x2160 (4K) native resolution

WiFi & Bluetooth

Smart TV apps (including Netflix, YouTube, Vudu, more)

3 HDMI inputs