hkpowerstore via eBay offers this 1000mAh External Backup Battery for Apple iPhone / iPod in White (pictured) or Black for $3.84 with free shipping. That's pennies under our May mention and the lowest total price we could find in any color by $6, outside of the price below. It's compatible with Apple iPhone 3G, iPhone, iPod Touch, iPod Nano, iPod Classic, and iPod Video.