Big Lots, MacFrugal's, and Pic 'N' Save whatever the name where you live has Prestone portable 140 watt DC to AC power inverter, factory reconditioned with mfr warranty for $19.99. Comes w/cigarette lighter plug, one AC outlet. Great for using laptop in the car without draining its (the laptop's) battery. Also can be used for TV, DVD or VHS player for the kiddies in the back of the minivan. Edited to clarify which battery I meant. Sorry for any confusion.