This deal has ended.
Update: this is back up to $8.99! Likely for today only, Buy.com has Nyko Nintendo Wii Wireless Nunchuk Adapter for just $5.99. The wireless adapter for the Wii Nunchuk easily converts your wired Nunchuk into a wireless peripheral for your Wii Remote. Shipping for this item is free and there's no sales tax (except NY, CA, MA, TN, MD).