For Prime members, TDC Direct via Amazon offers the Halo Screen Protector for iPhone 5 3-Pack for $7.95. Coupon code "6NCTHMHH" makes it $3.95. With free shipping, that's $1.32 per unit and the lowest total price we could find. (Non-members can spend over $25 for free shipping; otherwise, shipping adds $4.99.) These screen protectors are UV- and scratch-resistant. Coupon ends after 100 uses.

Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months.