Amazon.com: GIGABYTE M32U 32" 144Hz 4K FreeSync Compatible Gaming Monitor, SS IPS, 3840x2160 Display, 1ms Response Time (MPRT), 1x Display Port 1.4, 2x HDMI 2.1, 3x USB 3.0, 1x USB Type C : Electronics
ASUS TUF Gaming VG28UQL1A HDMI 2.1 Monitor — 28" 4K UHD (3840 x 2160), Fast IPS, 144
The cheapest 4K 144Hz HDMI 2.1 monitor is down to £399 at Currys | Rock Paper Shotgun
AVOID these 3 mistakes with HDMI, 144Hz and 4K - Techspin