As one of its daily deals, Sears offers the DieHard 425-watt Power Inverter, model no. 71496, for $24.99. Choose in-store pickup to avoid the $6.99 shipping fee. That ties last month's mention as the best price we've seen. (It's also a current via-pickup price low by $10.) It features a 12-volt plug, on/off switch, LED power indicator, and alarm. Deal ends today.
Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts.