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You'll probably be better off with a spare battery. The only advantages with battery grips is the increased continuous shutter rate, IR shutter trigger and longer battery life, but the downside is lots of extra weight and bulk. I only use mine when I need one or other of these features.
If you do decide to go down this road make absolutely sure that it's suitable for your D3000. Nikon take great delight in making each camera model different in this respect.
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