Electronic Express via Rakuten offers the Samsung 28" 4K LED-Backlit LCD Ultra HD Monitor, model no. U28E590D, for $369 with free shipping. That's the lowest total price we could find by $29, outside of the prices below, although we saw it for $69 less last month. It features a 3840x2160 (4K) native resolution, 1ms response time, LED backlight, picture-in-picture dual input display, and two HDMI inputs.
A close price: Best Buy and Amazon each charge $369.99 with free shipping.