Amazon offers its Amazon Prime members the Belkin Mini Surge Protector with USB Charger, model no. BZ103050-TVL, for $12 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping adds $5.58.) That's the lowest total price we could find by $3, although it was $2 less last spring. This portable surge protector features three AC outlets and two powered USB outlets for MP3 players and mobile phones.

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.)