Late last year Nintendo made a gold Nunchuk, matching the golden Wii remote for The Legend of Zelda: Skyward Sword, available for Club Nintendo members in Japan. The company's now decided that North American members can pick up one, too.
You'll need a balance of 900 coins in Club Nintendo's rewards program to claim it. Supplies are limited. The accessory can be claimed at the link below.
Gold Nunchuk Accessory [Club Nintendo]