Amazon.com : STK EN-EL9 EN-EL9a Battery Replacement for Nikon D3000, D5000, D40, D60, D40X : Digital Camera Batteries : Electronics
Canon BP955 Intelligent Lithium-Ion Battery Pack (C100, C100 Mark II,
Amazon.com : Wasabi Power Battery (2-Pack) and Charger for Nikon EN-EL9 and Nikon D40, D40x, D60, D3000, D5000 : Digital Camera Batteries : Electronics
1800mAh EN-EL9 EN-EL9A Batteries + LED Dual Charger for Nikon D40 D40X D60 D3000 D5000 Digital Camera
Powerextra 2 Pack Replacement Battery for Nikon EN-EL9 and Nikon D40 D40x D60 D3000 D5000 Cameras