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Walmart offers the Polaroid 50" 4K HDR Flat LED Ultra HD Smart Television, model no. 50T7U, for $189.99 with free shipping. That's $10 under our Black Friday mention and one of the cheapest 50" 4K TVs we've seen. (It's the first name-brand we've seen under $200 and a low price by $110 today.) It features a 3840x2160 (4K) native resolution, Smart TV apps (Netflix, YouTube, Vudu, more), and three HDMI inputs.