Dell 27 4K USB-C UltraSharp Monitor: U2720Q | Dell USA
LG 27UD68-P: 27 Inch Class 4K UHD IPS LED Monitor | LG USA
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
ViewSonic VP2780-4K, 27 Monitor
Buy LG UltraGear 27UL500-W 4K Ultra HD 27” IPS LCD Gaming Monitor - White | Free Delivery | Currys
Costco offering 27-inch 4K Philips monitor for about $80 off