Costco offers its members the TCL 50" 4K 2160p LED-Backlit LCD Smart Roku HD Television, model no. 50UP120, for $399.99 with free shipping. That's the lowest total price we could find by $100. It features a 4096x2160 (2160p) native resolution, Internet apps like YouTube and Netflix, Roku TV smartphone app compatibility, WiFi, and four HDMI inputs.