Prime members only. Amazon with INNOCN has the INNOCN 27" Mini LED 60Hz 4K Monitor on sale for $250 (Prime price) - $50 off coupon (click checkbox) = $200 with free shipping. Designed for productivity, not gaming. 

• 27" Mini LED IPS (3840x2160), 60Hz Refresh Rate, 450 nits brightness
• 2 x HDMI 2.1, 1 x DP 1.4, 1 x USB-C (65W Charging)