1byone via Amazon offers its 1byone 36-watt 3-Port Car Smart Charger for $8.99. Coupon code "GUODO6BO" cuts the price to $5.99. Plus, Prime members qualify for free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.01.) It features three smart charging ports designed to adjust amperage up to 2.4A depending on your device's maximum acceptable amperage. Deal ends March 25.