LG 27UD68-P 27" FreeSync IPS LED Monitor 4K UHD 3840 x 2160 16:9 Widescreen On-Screen Control with Screen Split Game Mode & Black Stabilizer HDMI DisplayPort - Newegg.com
Asus has a 32-inch 4K gaming monitor with HDMI 2.1 shipping later this year - The Verge
Portkeys HS7T II Metal Edition 7 inch 1200NIT Bright 4K HDMI/3G-SDI Monitor with 3D LUTT - HS7T II Metal Edition 7 inch monitor
ASUS TUF 28” Fast IPS 4K 144Hz HDMI 2.1 1ms G-SYNC/FreeSync Gaming Monitor with HDR (DisplayPort,USB) VG28UQL1A - Best Buy
Amazon.com: Sceptre IPS 27" 4K UHD LED Monitor up to 75Hz DIsplayPort HDMI DVI Build-in Speakers, Frameless Machine Black 2020 (U279W-4000R) : Electronics
FeelWorld F5 5.0" Full HD HDMI On-Camera Monitor with 4K F5 B&H
Lilliput 5" 4K HDMI Full HD On-Camera Monitor A5 B&H Photo Video