eCase via Amazon offers the Kmashi 400-Amp 8,000mAh Compact Car Jump Starter Power Bank for $39.99. Coupon code "JRZVFYX6" cuts that to $31.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, it costs an extra $7.) That's $57 off and the best price we could find. It features an LED flashlight with three modes and advanced safety protection. Deal ends September 30.