I noticed that the little manual which comes with the camera mentions a "fast charger" available on the online store... I went to the site, and searched, and searched for the online store.
I had to find a note in one of the forums about the store "coming in the future".
It may be more intuitive (and fast, and cheap) to implement the online store page already on your site, with a mention of the items "coming soon". Maybe even an email system where you can email folks who express interest at buying accessories. That way you'd have a sense for the pent-up demand out there.
Also, that way, the documentation would match the product ;-)