BettyAngel 
Amazon has 27″ Dell S2721QS 4K UHD IPS Monitor (Silver) on sale for $299.99. Shipping is free.
Specs:
Resolution: 3840×2160 (4K @ 60Hz)
Response Time: 8ms (5ms Fast)
Refresh Rate: 60Hz
Contrast Ratio: 1300:1
Viewing Angles: 178/178 degrees
Inputs
HDMI 2.0
DP1.2
