Just picked up the 40" Samsung UN40KU6290 4K UHD HDR Smart LED HDTV at Costco for $289.99. Was told they just got them in stock and they are going fast!
Specs
Resolution: 3840×2160
Smart, WiFi, UHD, HDR
Refresh Rate: 120Hz (motion rate)
Inputs
3x HDMI
2x USB
Ethernet
Component
Composite (shared w/ component)
Optical Out
http://www.displayspec