BESTEK through Amazon has their BESTEK 150W Power Inverter DC 12V to 110V AC Converter 4.2A Dual USB Car Adapter in grey for $11.99 (15.98 – 3.99 coupon) with Free Shipping for a limited time. To get the discount, use the coupon code: SVSG5UQU at checkout.

BESTEK Power Inverter with 2 USB ports and one AC outlet for use with only for DC 12V and Car. It features isolation voltage protection, AC outlets with built-in safety door, dual-USB 4.2A output, and aluminum alloy housing.