Dell Home offers the newly-released Dell 28" 4K LED-Backlit LCD Monitor, model no. P2815Q, for $699.99. Coupon code "T2LLG$98G7$F19" cuts that to $629.99. With free shipping, that's the lowest total price we could find by $87. It features a 3840x2160 native resolution (four times that of 1080p), LED backlight, and HDMI input.

Of note, this item is expected to ship on March 18.

Update: The price now automatically drops in-cart to $559.99, without the use of the coupon.