Ending at 5 pm ET today (or when 100% claimed), Getwow Inc. via Amazon offers Prime members its Getwow Quick Charge 2.0 18-Watt Car Charger Adapter in White or Black for $6.49 with free shipping. (Non-members can qualify for free shipping with orders of $35 or more; otherwise, shipping adds $6.01.) That's $19 off list and the lowest total price we could find. It purports to charge up to 75% faster.