eCase through Amazon has the Kmashi 400-amp 8,000mAh Compact Car Jump Starter Power Bank for $27.99 (regularly $49.99) with Free Shipping for a limited time.
This Kmashi power bank is ultra compact, easily stores in your glovebox, and lightweight enough to put into your travel bag. It features an 8,000 mAh battery capacity that is capable of jump-starting a 4L gasoline or 3L diesel vehicle engine up to 10 times. It has a built-in emergency flashlight with three modes that lets you flag down passing cars if you’re in trouble. It has advanced built in safety protection and a USB port that lets you charge your smartphone or other tablets on the go.