Go to any games shop, play or anywhere else and these are usually out of stock. Why? Because some of the most popular Nintendo Wii games with a multiplayer feature need them.
I advise you to have at least two, or one or every remote. Most people think that it is far too much money for just an accessory, but the nunchuck has 3 axis motion just like the controller.
Costly and rare, the nunchuk is a Wii owners dream and nightmare.