DailySale offers the ZAGGkeys Folio Keyboard Case for iPad Air, model no. ZKFHFBKLIT105, for $39.99 with free shipping. That's tied with last week's mention as the lowest total price we've seen. (It's a current low by $12.) It features a Bluetooth keyboard that purportedly has 30% more typing space than similar cases, backlit keys, and three months of use on one charge.
Note: The countdown timer on the product page does not reflect an actual expiration time and resets daily.