hkpowerstore via eBay offers this 1000mAh External Backup Battery for Apple iPhone / iPod
in White (pictured) or Black for
$3.69 $3.68 with free shipping
. That's pennies under our July mention and the lowest total price we could find by $1. It's compatible with Apple iPhone 3G, iPhone, iPod touch, iPod nano, iPod Classic, and iPod Video.
Update: Shipping now costs
20 cents 35 cents.