HandHeldItems via Amazon offers the CoverBot High Output Dual USB 3.1-amp 15-watt Car Charger in Black or White for $7.99. Coupon code "cbotdual" drops it to $4.99. Prime members bag free shipping. (Non-members can spend $25 or more to receive free shipping; otherwise it adds $5.07.) That's $2 under the lowest total price we could find for a similar 3.1-amp, 15-watt car charger sold elsewhere. This charger is compatible with a range of USB devices and features two ports. Note that a USB cable is required but not included.