Newegg offers the Kensington KeyCover Hard Shell Bluetooth Keyboard Case for iPad Air, model no. K97007US, for $16.99 $13.49. Coupon code "EMCAPAS38" cuts it to $13.49. With free shipping, that's the lowest total price we could find by $5, although we saw it for $4 less three weeks ago. (Most retailers charge $54 or more.) It features a QuickRelease corner, magnetic well for landscape or portrait viewing, auto-wake and sleep functionality, and scissor keys.

Update: The coupon code now drops it further to $9.99.