Walmart offers the RCA 75" 4K LED-Backlit LCD Ultra HD Television, model no. RTU7575, for $799.99. Opt for in-store pickup to dodge the $19.97 shipping fee. That's tied with last week's mention as the cheapest 75" 4K TV we've seen. It features a 3840x2160 (2160p) native resolution, LED backlight, and four HDMI inputs.