OLED iPhone X replacement screens are available at iPlayPower. OLED Display is the standard display type for the iPhone X. There are cheaper aftermarket LCD displays available advertising an iPhone X glass screen repair price averaging $125 - $150 in repair cost. These screens are of much lower quality and would be considered counterfeit by Apple and Cellphone providers (AT&T, T-Mobile, Sprint, etc). Mobilesyrup has a very good article about the quality difference between OLED and LCD using an iPhone XS and XR here:
Glass Touch Screen: If the top touch screen (glass top) is cracked or broken with shattered glass, or your iPhone X has a non responsive touch screen, but the image under it is fine.
Complete Screen with Touch Panel and OLED: If the top touch screen (glass top) is cracked or broken with shattered glass, and the OLED image is dim, has black spots, lines, or white spots
OLED Only: If you do not see anything when your iPhone X is on, or if you do and the screen display is dim, has black spots, lines, or white spots, then you probably have a damaged OLED.
iPhone X Data Connector and Charging Port Repair Service. This repair provides a new lightning port ...