The diplay can be purchased from here
https://s.click.aliexpress.com/e/_DCM2ltX
This link is affiliated URL. If you purchase via link above it will give tiny cent of commission to the community organizers.
(We are not Mellow employees, just 3D printer enthusiasts)
This will not hurt your wallet and at the same time help us to maintain the GitHub better.
https://www.youtube.com/watch?v=BxHxfFSkkoQ
Please be aware for the direction when you insert the FFC cable.
Detail instruction
https://mellow.klipper.cn/#/advanced/screen?id=lcd-dsi