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Walmart offers preorders of the Polaroid 55" 4K HDR Flat LED Ultra HD Smart Television, model no. 55T7U, for $239.99 with free shipping. That's the best deal we could find for this model by $210 and the second-lowest price we've seen for any new 55"-class 4K Smart TV. It features a 3840x2160 (4K) native resolution, smart TV apps (including Netflix, YouTube, Vudu, more), and three HDMI inputs.

Note: It's expected to ship by January 3, 2019.