AnkerDirect via Amazon offers the Anker 24-watt 2-Port Rapid USB Car Charger in Black, model no. AK-71AN2452CSS-BLA, or White, model no. AK-71AN2452CSS-WLA, for $19.99. Coupon code "H4QBSNCF" cuts it to $13.99. Plus, Prime members receive free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $5.99.) That's $16 off list and the lowest total price we could find. It's compatible with most USB-charged devices and includes a 3-foot Apple MFI-certified Lightning cable.