Even though those show up on their website, none of the 4K models are available on Amazon/Walmart or at best have very limited/erratic stock. I only see the 75” one in stock, and only on Walmart. Furthermore, they are just simply worse quality than a comparably priced smart TV. For the same price as their 55” 4K HDR TV you can get a TCL that’s also QLED and has local dimming, plus HDMI 2.1 and google TV do you can put it in a dumb mode anyways. So really there isn’t a great reason to get one of these.