Anker Direct via eBay offers its Anker PowerCore 13,000mAh Portable Battery Pack for $29.99. Apply coupon code "PSHOPEARLY" and check out with PayPal to cut the price to $23.99. With free shipping, that's $6 under our July mention and $7 below the best price we could find for a similar Anker battery pack elsewhere. It features two USB charging ports. Deal ends November 20.

Note: This coupon can be used twice per PayPal account.