Use Amazon coupon code IDUOFREE
Amazon has this New Trent iTorch IMP52D 5200mAh External Battery Pack bundled with this New Trent IMP50D 5200mAh External Battery Pack
w/ 2x USB Ports for $72.90. Use the coupon code and the price drops to $39.95. Note, add both to your cart to see the deal. Shipping is free.