Verizon Wireless has Official Apple Smart Folio for 12.9" iPad Pro 2018 Models (Charcoal Gray; MRXD2ZM/A) on sale for $30. Shipping is free.
The Smart Folio for 12.9" iPad Pro (2018) offers protection for both the front and back. It also provides open-to-wake and close-to-sleep functionality. Offer valid while promotion/supplies last.