I've got this gun for my Wii; and it is really good as it houses both the Wii Remote and Nunchuk making games where you have to shoot / walk etc at the same time easy to do rather than faffing.
Use the Big Bang Wii Light Gun to convert your Wii Remote and Nunchuk into a blaster.
Superior firing action for a more authentic Wii shooting experience, Blaster holds both the Wii Remote and Nunchuk. Connects quickly and safely, no batteries required. Suitable for all Wii shooting and first person titles.
Same price at Play but 2 week delivery delay - elsewhere (from what I can find) this is around £10 to £18