can i buy apple iphone X screen without repalacement and how much does it cost

KiltedTim is correct. You cannot purchase an authentic iPhone X screen from Apple, nor from anyone else either. If you want to have the screen replaced on your iPhone with authentic screen, schedule an appointment at your Apple Store Genius Bar or Apple Authorized Service Provider and pay them to replace the screen with an authentic screen.

Don't make a costly mistake and do it any other way. It may save you money up front, but you could well damage the phone and if you or anyone other than Apple or an Apple Authorized Service Provider touches your phone, Apple will not offer any support to that phone going forward.

No.

The only devices eligible for self repair are the iPhone 12 and newer.

Check this on self service repair Self Service Repair - Apple Support

I would only reccommend it if you're really handy with tech tho, it is rather complicated to do this repairs yourself