CTCStore offers Amazon Prime members the Acase Superleggera Case for Apple iPhone 4 and 4S in Black for $9.95. Coupon code "VQKMJRSS" cuts it to $5.45. With free shipping, that's $1 under our July mention and the lowest total price we could find by $10. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $5.07.) This polycarbonate and silicone case protects against dust and scratches. Coupon expires October 14.

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.