Kedsum via Amazon offers the Kedsum 3-Port USB Car Charger, model no. KED080, for $14.99. Coupon code "7QJ6C45M" cuts it to $7.49. Plus, Prime members qualify for free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.10.) That's $27 off list and the lowest price we could find. It features seven amps of power, a red LED voltmeter display, 5-foot extension cord, and compatibility with most USB-charged devices.