Whistler PI-400W 400 Watt Power Inverter for $19.00.  Here is a screenshot for your reference.  Shipping is free on orders over $25.  If needed, use this Filler Tool to pad the order to qualify for free shipping.  Alternatively, it is available here for the same price.  It converts 12-Volt-DC power into 2 standard AC outlets, allowing the uses of a variety of tools utilizing stadnard plugs in a vehicle.  Most places have this inverter for over $25.  In fact, Best Buy currently has it for about $39.