Weme via Amazon offers the Alxum 24-watt Dual-Port USB Compact Car Charger for $7.99. Coupon code "UR399KXW" cuts it to $6.99. Plus, Prime members bag free shipping. That's essentially tied with our September mention, a buck off, and the lowest price we could find. It features up to 4.8-amp power output and can charge two devices simultaneously. Deal ends November 30.