Amazon offers the TCL 50" 4K2K 2160p LED LCD HD Television, model no. LE50UHDE5691, for $627 with free shipping. (Fry's has an open-box unit for the same price.) That's among the cheapest 4K TVs we've seen and the lowest total price we've seen for this model without rebate hassles. (We we saw it via rebate for $7 less in January.) It features a 3840x2160 resolution — four times that of 1080p TVs. It also has a 120Hz refresh rate, LED backlight, and three HDMI ports.