Walmart offers Apple Smart Keyboard for iPad (7th Generation), iPad Air (3rd Generation), and iPad Pro 10.5in - US English for $129.95 (orig. $159.99) with free shipping.

Product Description:
The Smart Keyboard combines advanced technologies to create a keyboard like no other. It's a full-size keyboard that's fully portable, and it connects to the new iPad and iPad Air with the Smart Connector. Just attach the Smart Keyboard and start typing. And when you're done, it folds to create a slim, lightweight cover.