Yugster offers the LifeBox UltraCharge 10,000mAh Portable Power Bank and Car Jump Starter, model no. UC10000, for $39.97. Coupon code "FreeYugBuck" cuts it to $38.97. With $4 for shipping, that's a buck below our mention from June and the lowest total price we've seen. (It's a current best by $6.) It features jumper cables, LED flashlight, USB adapter cable, iPhone 4 USB cable, and two USB ports.

Note that the countdown timer on the product page does not reflect an actual expiration time and resets daily.