Bestek via Amazon offers its Bestek 200-watt Car Power Inverter, model no. MRI2011KLB-KFST, for $27.99. Coupon code "V5Y4BO8A" drops it to $17.91. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.87.) That's the lowest price we could find by $12. It features peak power of 400 watts, two AC outlets, two USB ports, and a car cigarette plug.