Amazon.com: Dell 32 Inch 4K Monitor, UHD (3840 x 2160), 60Hz, Dual HDMI 2.0, DisplayPort 1.2, 4ms Gray-to-Gray in Extreme Mode, 1.07 Billion Colors, SE3223Q - Black : Electronics
Dell UltraSharp U4320Q and U2720Q are the latest 4K USB-C monitors from Dell for professionals
Dell U2720Q UltraSharp 27 Inch 4K UHD 3840 x 2160 LED Backlit Gaming Monitor with IPS, Vesa Compatible, Anti-Glare, Tilt, Swivel and Pivot (HDMI, USB-C and DisplayPort) LCD / LED Monitors - Newegg.com
Dell UltraSharp U2720Q 27 Inch 4K UHD (3840 x 2160) LED Backlit LCD IPS USB-C Monitor (7GZ651) - Walmart.com
Dell U2720Q 27 | Best Monitor | Aventis Systems
Dell U2720QM Ultrasharp 27" 4K IPS LED USB-C Monitor (Display, HDMI, USB) Black FT2VY - Best Buy