For its members Costco offers the offers the Philips 50" 4K 2160p HDR LED-Backlit LCD Ultra HD Smart Television, model no. 50PFL6902, for $399.99 with free shipping. (Non-members pay an additional $20.) That's the lowest price we could find by $103 and the cheapest 50" 4K TV we've seen with HDR capabilities. It features a 3840x2160 (4K, 2160p) native resolution, Dolby Vision HDR, LED backlight, Smart TV apps, 802.11ac wireless, USB, and three HDMI inputs.