DBRoth via Amazon offers the Duracell 175-watt DC to AC Pocket Power Inverter with USB Port, model no. DRINVP175, for $39.99. Coupon code "RFY9V5WA" cuts it to $27.99. With free shipping, that's $4 below our mention from four weeks ago and the lowest total price we've seen. (It's a current low by $11.) This device connects to a 12-volt car outlet to convert it into a 120-volt AC outlet and is able to simultaneously run and recharge both an AC and USB device.