eCase via Amazon offers the Kmashi 400-Amp 8,000mAh Compact Car Jump Starter Power Bank for $39.99. Coupon code "S9SYJDK7" cuts that to $29.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $7.) That's $2 under our September mention, $59 off, and the lowest total price we could find. It features an LED flashlight with three modes and advanced safety protection. Deal ends January 31.