New Trent offers its New Trent iFuel Smartphone Charger 5,000mAh External Battery Pack, model no. IMP500, for $39.95. Add two to your cart for $79.90 and apply coupon code "CONGRATS" to drop it to $39.95. With free shipping, that's $19.98 per charger and the lowest total price we could find for the pair by $30. It comes with a USB cable, microUSB tip, and miniUSB tip.