anyone know where i can get one?

The only one i am aware of is the one that comes with links crossbow training but i dont want the game just the zapper.

Play have one listed http://www.play.com/Games/Wii/4-/3516607/Wii-Remote-Gun-Holder/Product.html but not sure if it is the official one or not, the comments are not very helpful. I am not one for the cheap unbranded gear that is never the same quality as the official products.

This is your official one, with the Links Crossbow training.

http://www.argos.co.uk/webapp/wcs/stores/servlet/Search?storeId=10001&catalogId=1500001001&langId=-1&searchTerms=crossbow&x=0&y=0

Not sure if you can buy the official zapper without it, so youll probably have to resort to 3rd party (eggs link for example).