2 Cheapest 27 inch 144hz gaming monitors: Acer ED273 and Acer KG271 for ESports
Acer KG271 Cbmidpx 27" Full HD 1920 x 1080 144Hz 1ms DVI HDMI DisplayPort AMD FreeSync Technology Built-in Speakers Backlit LED Gaming Monitor - Newegg.com
Acer debuts KG251Q and KG271 gaming monitors with 75Hz refresh rate
Refurbished: Acer KG271 Cbmidpx UM.HX1AA.C02 27" Full HD 1920 x 1080 1ms (GTG) 144 Hz DVI, HDMI, DisplayPort AMD FreeSync Built-in Speakers Gaming Monitor - Newegg.com