AnkerDirect via Amazon offers Prime members its Anker 24-watt Dual USB Car Charger in White, model no. AK-71AN2452C-WA, for $9.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $5.11.) That's the lowest total price we could find by $4, although we saw it for pennies less during Black Friday. This 24-watt charger has one Apple (2.4A max) and one Android (2.4A max) port to simultaneously charge two devices with large batteries, such as iPads.