CTCStore offers Amazon Prime members the Acase Superleggera PRO Dual Layer Case for Apple iPhone 4 and 4S in White/Black for $12.95. Coupon code "LAQ326CB" cuts it to $5.95. With free shipping, that's a tied with our expired mention of it in black from three days ago and the lowest total price we could find for this case. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $5.05.) It fits the iPhone 4 / 4S for AT&T, Verizon, and Sprint. Deal ends December 3.

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. (Note that currently there's a waitlist for Amazon Mom.)