As one of its Black Friday ad deals, Best Buy offers the Insignia 50" 4K HDR Flat LED Ultra HD Smart Fire Television, model no. NS-50DF710NA19, for $279.99 with free shipping. That's $100 off list and the lowest price we've seen for a 50" Fire TV. Deal ends November 11. Features include:

3840x2160 (2160p) native resolution

Fire TV apps

Alexa voice control

3 HDMI ports, 1 USB port