I was looking for the AH-4 Nikon handgrip for my D300 as I did not want to carry my camera on a strap all the time. After looking around quite extensively on the web, I settled on this product, which is available for a variety of cameras: http://www.camdapter.com/products.html
. To me, it seems better than the usual fare one can find on ebay. The leather is thicker, available in a variety of colors, and the backplate is I think of a better design than the norm. for instance, it allows you access to the battery, whereas I'm not so sure the others do due to a bigger backplate (attaches to the camera's tripod mount).
I'll post some feedback after I receive it.