Rearth USA offers the Verco Apple Keyboard Cover for $12.99. Coupon code "BACKTOSCHOOL" slices it to $9.09. With free shipping, that's tied with our mention from June and the lowest total price we could find by $7. This silicone keyboard cover is compatible with all Apple Keyboard models (without numeric keypad) including the MacBook, MacBook Pro (after 2008), and MacBook Air. (It's not compatible with the 2010 13" MacBook Air.)