Best Buy offers the Samsung 55" 240Hz 4K 2160p WiFi LED-Backlit LCD Smart Ultra HD Television, model no. UN55HU6830FXZA, for $899.99 with free shipping. That's $500 off list and the best-ever price we've seen for a Samsung 55" 4K UHDTV. It features a 3840x2160 native resolution, 60Hz refresh rate (240 Clear Motion Rate), LED backlight, WiFi, Smart TV apps (including Hulu Plus, Netflix, YouTube, and more), USB, and four HDMI inputs.
Update: Specs corrected.