Sears offers the DieHard 140-watt Power Inverter with USB, model no. 71522, for $16.99. Opt for in-store pickup to dodge the $6.50 shipping charge. That's $3 under our July mention and the lowest price we've seen. (It's a current low by $4.) This fan-cooled adapter plugs into your car's DC outlet and provides power through a 110-volt household AC outlet and USB port.
Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts. Plus, Shop Your Way Max members are eligible for free shipping.