As one of its daily deals, Tanga offers the Marware 2,600mAh AMPED Portable Charger in Silver for $11.99 plus $2.99 for shipping. That's the lowest total price we could find by $37, although we saw it for $5 less last summer. It works with most USB-equipped devices, including phones, cameras, handheld gaming devices, and tablets. Deal ends today at 10 am ET.