If you already have a 144Hz monitor, don't bother with a 240Hz one - HardwareZone.com.sg
The 5 Best 240Hz Monitors - Spring 2021: Reviews - RTINGS.com
ASUS ROG SWIFT PG258Q, 25 Inch (24.5 Inch) FHD (1920 x 1080) eSport Gaming Monitor, 1 ms, Up to 240 Hz, DP, HDMI, USB 3.0, G-SYNC: Amazon.co.uk: Computers & Accessories