Walmart offers the RCA Virtuoso 55" 4K LED Flat Ultra HD Smart Television, model no. RNSMU5536, for $299.99 with free shipping. That's $500 off list and the lowest price we could find, although it was $30 less a month ago. Features include:

3840x2160 (4K) native resolution

Bluetooth and WiFi

3 HDMI and 2 USB inputs

Smart TV apps (Netflix, YouTube, Twitter, Facebook, etc.)