QCellDirect via Amazon has 2-Pack Tempered Glass Screen Protector for iPhone XR/iPhone Xs Max for $2.94. Shipping is free.

From the Product Page:

  • Easy to Install – take only a few minutes to install with no bubble. Only four steps to perfectly protect your iPhone XS Max.
  • Ultra-Thin & High HD Clarity – 0.3mm film offers 99% transparency to provide natural viewing experience and accurate touch screen response.
  • Face ID is compatible and Anti-FingerprintThis glass screen protector is designed for iPhone Xr/XS Max with anti-fingerprint coating and Face ID compatibility.
  • Kit Includes – 2* Tempered Glass Screen Protector, wet/dry wipes, cleaning cloth, dust stickers.

2018 iPhone XR Screen Protector 2pack

https://amzn.to/2SRFDFI

Use code WLSF8V4G

2018 iPhone XS Max Screen Protector 2pack

https://amzn.to/2SPSjx2

Use code X8TZK89L