FREE: Clear back cover for 10.5" iPad Pro/iPad Air 3
This item: https://www.amazon.com/ESR-Clear-Perfect-Keyboard-Compatible/dp/B073DY94FC/ref=sr_1_3?keywords=ESR+Yippee+Hard+Shell+for&qid=1568222252&s=gateway&sr=8-3 . Rear cover works with Apple's Smart Cover. I've not used the item.