I skipped the Black Friday/Cyber Monday sales, but I bought this today:
Wagan EL2402-5 Smart AC 200 Watt Inverter with 5V 2.1 Amps USB Power Port. It is currently $25.93, which is 45% off list price. It has two grounded AC outlets and a USB port. I'll use it to keep my Kindle, tablets, and other electronic gadgets charged while car traveling.