Hot Holiday TV Deal: 50-inch Sony KD50X690E 4K Smart TV for under $450 Posted on 09/12/2017 by i4u Best Buy released a new Holiday doorbuster deal today. The 50-inch Sony KD50X690E 4K Smart TV is on sale only today for $449.99. Best Buy has cut the price by $250.The Sony KD50X690E does...