Motto via Amazon offers its Motto Tempered Premium Ballistic Glass Screen Protector for iPhone 6 for $11.78. Coupon code "OK2MKBM6" cuts it to $5.78. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it costs $6.01.) That's $6 off list and the lowest total price we could find. It is 0.26mm thick and features a hardness of 8-9H, light penetration ratio of 97%, and oleophobic coating that prevents fingerprints and other contaminants.