eBay with vipoutlet has the Cyberpower 160W Power Inverter w/ 2 Outlets, 2 USB-A Ports (Black/Red; CPS160PPB2U) on sale for $20 - 15% off with coupon code SCORESAVINGS [Exp 8/25] = $17 with free shipping. Converts your car's DC battery power into household AC power.