Power Management Deals with Free Shipping

Amazon offers the Whistler 1,600-watt Power Inverter, model no. XP1600i, for $113.99. Clip the coupon on the product page to cut that to $92.99. With free shipping, that's the lowest total price we could find by $50. It features an LCD display, three AC outlets, and a USB port.

Note that this item will take up to two months to ship.

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 "YFT4INX7" cuts it to $27.99. With free shipping, that's tied with our October mention as the lowest total price we've seen. (It's also a current price low by $12.) 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.