Ebay offers iPhone 6, 6S, 7, 8, X, X-max, XR, 11, ALL Plus Tempered Glass Screen Protector for $0.99 with free shipping.

Product Description:
The Tempered Glass Screen Protector is made with specially processed glass to protect the screen of your device from drops, shocks, and scratches by effectively absorbing the impact. Our Ultra-Sensitive Touch Technology allows you to freely navigate your device, with the same responsiveness you've come to expect. Easy to Apply! 
Specifications: 

• 9H Hardness
• Anti-Fingerprint
• Anti-Scratch