For sale is my used CoolerMaster GP27U monitor. It works well, it has great picture quality (IPS with 576 dimming zones for HDR content) and USB-C KVM with 90W PD.
Reason for selling is that I have upgraded to an OLED 240Hz.
Price is firm, in person pickup only. Comes with bunch of cables and power supply brick, but I don't have the original box any more.