Was having a look to see if there were any affordable 4k High HZ monitors yet, came across this, seems to have pretty good reviews across Amazon:
- 9-17 days delivery time from the US
 - Lowest AU price seems to be around $1400
 
Specs: 
- 120HZ base if not overclocked 144hz overclocked.
- Supports Freesync 
- 3160x2140p 4k 
- 1ms (OD)/HDR-Ready
-  IPS Panel
-  G-Sync-Ready / Fresync compatible 
- 2X HDMI 2.0, 2X DP 1.4
- 3.5mm/Height, Tilt, Swivel, Pivot


HDMI 2.0 though, how can they have 120hz 4K but no HDMI 2.1 support… (yes I know DP)