Acer XF250Q Cbmiiprx 24.5" Full HD (1920 x 1080) Zero Frame TN Gaming Monitor with AMD FREESYNC Technology – 1ms | 240Hz Refresh (Display, HDMI 2.0, HDMI 1.4 ports) https://www.amazon.com/dp/B07G3GR…pCbBS
I think this is the cheapest 240hz monitor ive seen. please notice this is a TN panel mainly use for competitive gaming.