Gooloo via Amazon offers its Gooloo 40-watt Portable Surge Protector Travel Power Strip with USB Charger for $23.99. Coupon code "B4P9QHWD" cuts it to $17.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $7.12.) That's a buck under our mention from three weeks ago, $42 off list, and the lowest total price we've seen. It features four grounded AC outlets, four USB ports, and a 5-foot cord.