GeekBuying via Amazon offers the Tronsmart Quick Charge 2.0 42-watt 3-Port Car Charger, model no. CC3PC, for $17.80. Coupon code "3USBCHAR" cuts it to $7.50. Plus, Prime members receive free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.18.) That's a buck under our September mention and the lowest total price we could find now by $5. This Qualcomm-certified charger comes with a 3.3-foot USB charging cable.