Amazon sells the Apple Smart Keyboard Folio priced at $180.49 for iPad Pro 12.9-inch. This is a match for it’s all-time low and is the best available, down from its $199 going rate. The Smart Keyboard Folio of Apple has no batteries and thanks to the Smart Connector, it never needs to be recharged. It also covers your tablet’s back and provides all-around coverage.
From the Product Page:
√ The new smart keyboard Folio is designed to deliver a great typing experience on a full-size keyboard whenever you need it.
√ No need for batteries or pairing. Its durable lightweight cover protects both the front and back of your new 12.9-inch iPad Pro.
√ Simply attach to your new iPad Pro and Type away.
√ Compatible with 12.9-Inch iPad Pro (3rd Generation).