Amazon.com : Wasabi Power Battery (2-Pack) and Charger for Nikon EN-EL9 and Nikon D40, D40x, D60, D3000, D5000 : Digital Camera Batteries : Electronics
Amazon.com : Powerextra 2 x EN-EL9 Battery & Charger with LCD Display Compatible with Nikon D40 D40x D60 D3000 D5000 Cameras : Electronics
2 PACK EN-EL9A ENEL9 Rechargeable Battery for Nikon D3000, D5000 Camera | eBay
Nikon D3000 battery: what are the options?
Amazon.com : BM Premium EN-EL9, EN-EL9A Battery for Nikon D5000, D3000, D60, D40x & D40 Digital SLR Camera : Electronics