Walmart has the VIZIO P502ui-B1E 50" 4K Ultra HD 120Hz Full-Array LED Smart HDTV refurbished for $300 with free shipping to home or store. Features 3840 x 2160 Ultra HD resolution (4K UHD), 60Hz native / 120 enhanced, full-array LED backlight, local dimming, 802.11ac, Quad-core GPU + dual-core GPU, 5 x HDMI, 1 x USB.
Has good Amazon Reviews.
eBay has the Sony XBR55X850D 55" 4K Ultra HD Smart TV for $769 with free shipping. The discounted price is reflected in cart. Retail price: $1499. Features 3840 x 2160 (4K UHD), 120Hz refresh rate, edge LED backlight, built-in Wi-Fi, Android TV, HDR 10, Dolby Digital, 4 x HDMI.
Has excellent Amazon Reviews.
Ends 4/24. Best Buy has the Toshiba 55" 4K 2160p LED LCD UHD Smart TV (55L621U) for $430 with free shipping. List price: $450. Features a 3840x2160 native resolution, Chromecast Built-in, Wireless Connectivity, 3 HDMI inputs, 1 USB input.