Buy.com has a Delkin Devices Canon NB4L Battery- fits Canon SD-200 SD-300 SD-400 for $25.99 with Free Shipping.
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- Delkin Devices Canon 760mAh NB4L Replacement Battery fits Canon camera’s SD-200, 300 and 400. Delkin Devices Lithium Ion battery has increased longevity and charges compared to NIMH batteries. Guaranteed fit with specified Canon cameras and full 2 year warranty against any manufacturer defects