Abe's of Maine offers the Nikon MB-D10 Multi-Power Battery Pack, model no. 25359, for $229. Coupon code "DEALNEWS12" cuts it to $217. With free shipping, that's the lowest total price we could find by $22. It can be used with one EN-EL3e battery, EN-EL4a (Battery Chamber Cover BL-3 required), or eight AA batteries with the included MS-D10 battery tray. The pack can be used with Nikon D300, D300S, or D700 digital SLR cameras.