Amazon
has the ViewSonic VX2758-2KP-MHD WQHD 27″ 1440p 144Hz 1ms IPS Monitor for $297.17. Shipping is free.

• 2560x1440p (WQHD), 144Hz refresh rate, 1ms response time, IPS panel, 2 x 2.5W speakers, AMD FreeSync, HDMI 2.0, HDMI 1.4, DisplayPort 1.2