Amazon offers Vivitar APM-7582 Compact Power Grip for GoPro or Action Cameras for . Free shipping with Prime or on orders over $25.

Product Description: 
The Vivitar Compact Grip makes it easy to aim your camera and frame your shots. The grip provides more control and stability while shooting, and it's compact size lets you take it anywhere. A built-in 4000 mAh power bank will keep your camera charged and ready for action. The Vivitar Compact Grip also comes with an adjustable wrist strap to help keep your camera secure.