Update (7/1 8:50am): The 39-inch model is now down to $299 with free shipping. Now OOS
The prices of 4K TVs continue to drop with Seiki leading the way. Walmart is currently selling the 39-inch for $349 with free shipping. The 50-inch version is $429 with free shipping. The 55-inch is $579. All three are all time price lows for 4K TVs.
While these are HDTVs, many will use them as computer displays which yield 3840×2160 resolutions. They run 4K at 30Hz via HDMI 1.4 or 1080P at 120Hz and get 4/5 star reviews. They have 3 HDMI inputs, Tuner input and 2 USB inputs and support 4K upscaling.