Amazon offers its Amazon Prime members the Motorola microUSB Car Charger, model no. SPN5400A, for $3.64 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $5.08.) That's tied with our mention from two weeks ago and the lowest total price we could find by $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.