1byone Products via Amazon offers Prime members its 1byone 10,000 mAh Dual USB Ports Portable Charger in Black for $13.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, it costs an extra $5.99.) That's the lowest total price we could find by $3. It features an LCD display. Deal ends October 25 at 6 am ET.