RAVPower Dynamo-On-the-Go RP-PB08 Power Bank with Flashlight for $16.99 shipped. Here is a screenshot for your reference. Alternatively, it is available at Amazon for $19.99 with free shipping on orders over $25. If needed, use this Filler Tool to pad the order for free shipping. It has 2600mAh capacity with 1A output to charge most mobile phones and tablets. It also has a 4 LED status bar to indicate current battery status. At the time of this post, 200 out of 214 user reviews have given it 4/5 and 5/5 stars.