Amazon offers the 1byone Glass Screen Protector for Apple iPad Air /iPad Air 2 for $15.99. Coupon code "284DSFSM" cuts it to $4.99. Plus, Prime members bag free shipping. (Non-members can qualify for free shipping with orders of $35 or more; otherwise, shipping adds $8.22.) That's $24 off list and the lowest total price we could find. It features tempered glass with a 9H scratch-resistant surface.