eBay has the Battery Glass Cover for iPhone X, iPhone 8 Plus in $12.60 with FREE shipping.
Product Features:
Non-OEM but high quality replacement
Replace your broken, damaged and scratched back housing assembly with a new one
Each item has been checked and in good condition before shipping
This is not an easy job for someone who has no technical skills with Disassembling or Assembling cellphones/mobile phones, so only purchase this item if you know how to install it
Highly recommend professional installation. We will not be held responsible for any damages to your cell phone/mobile phone that you may cause during the changing of replacement parts