The Urge Basics Ultra Slim PowerPro 4000mAh Power Bank drops from $29.99 to $14.99 to $9.99 when you apply our exclusive code BDURGE10 in your cart at iTechDeals.com. Plus, the shipping is free. This is the lowest price we found for one by $3. They have a built-in Micro USB connectors and are slim enough to easily slide in an out of a pocket. There is no sales tax (except NJ).