As one of its daily deals, Tanga offers the Logitech Ultrathin Keyboard Cover for iPad Air in Black or White for $53.99. Coupon code "SPRINGSHIP" bags free shipping. That's the lowest total price we could find by $9, although most stores charge $70 or more. (For further comparison, we saw a refurbished model for $40 last week.) This aluminum cover weighs less than a pound and is less than a third of an inch thick. Deal ends May 20 at 10 am ET.