StackSocial offers The Pocket-Sized USB Power Pack for $14.99 with free shipping. That's the lowest total price we could find by $5 for a similarly sized charger. This charger adds a purported 10 hours of power to phones and tablets. Deal ends February 1.
What are you doing for fun that you could also do for money? Here are some ideas to get you thinking, and tips to get you started.