Yangdock e-Commerce via Amazon offers the Lumsing 24-watt 2-Port USB Car Charger in Black or White, model no. 206-1013-1191, for $7.99. Coupon code "CARSDEAL" drops it to $3.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.10.) That's $1 under our January mention and the lowest total price we could find for $1. It's compatible with iOS and Android devices. Deal ends March 31.