Meritline offers the Privacy Screen Protector for Apple iPhone 4/4S for $2.69. Coupon code "MLCKD07GNL1" cuts it to 99 cents. With free shipping, that's the lowest total price we could find for any such screen protector for the iPhone 4/4S. This protector is purported to make the screen viewable at 60°, but block it from other angles.