From The Wirecutter: The best 4K monitors (so far) | Ars Technica
Shop | Dell P2415Q - LED monitor - 23.8"
Dell adds two 4K monitors to cheaper P series review - FlatpanelsHD
Dell 23.8 Ultra HD 4K LED Monitor - 24 Class, 3840 x 2160, IPS, 1.07 Billion Colors, 2000000:1, 4K UHD, HDMI, DisplayPort, Mini DisplayPort, USB, 90W, Energy Star, Black (Open Box) - P2415Q-OB at TigerDirect.com