Newegg offers the Fremo P100 10,400mAh USB Power Bank, model no. P100, bundled with a Dual-Port USB Car Charger for $19.99. This $8 mail-in rebate cuts it to $11.99. With free shipping, that's $3 below our May mention and the lowest total price we've seen. (It's also $6 under the best price we could find for the power bank alone.) It's compatible with most 5-volt input USB-charged devices. Deal ends September 23.