Watch out for low battery price but artificially high shipping - you need to keep an eye on the total value of the order (which should be around $8 delivered, with a one year guarantee).
For example: http://cgi.ebay.com/Battery-BenQ-DC-E43-E53-E53-E63-E720-C500-CAMERA-/320511141882?cmd=ViewItem&pt=Batteries_Chargers&hash=item4a9ff3e7fa
Answers & Comments
Ebay is as good as any for this kind of supply.
Watch out for low battery price but artificially high shipping - you need to keep an eye on the total value of the order (which should be around $8 delivered, with a one year guarantee).
For example:
http://cgi.ebay.com/Battery-BenQ-DC-E43-E53-E53-E63-E720-C500-CAMERA-/320511141882?cmd=ViewItem&pt=Batteries_Chargers&hash=item4a9ff3e7fa