PNY.com has Power packs Buy one get one free.
Add one to cart, second will be added automatically, full price will be shown for both. Discount for free item will be given at final checkout. Shipping will be calculated, and then added to Discount = Free Shipping.
PowerPack AD5200 2.4 Amp 5200mAh Portable Battery Charger 2 for $11.99 [pny.com]
PowerPack AD7800 1 Amp / 2.4 Amp 7800mAh Portable Battery Charger 2 for $17.99 [pny.com]
PowerPack AD10400 1 Amp / 1 Amp / 2.4 Amp 10400mAh Portable Battery Charger 2 for $24.99 [pny.com]
Other options On Sale: Link [pny.com]
Payment Summary (AD7800 x2)
Signature Req'd: $0.00