Other places sell it for $20 plus. Eligible for FSSS if you spend $25.
Amazon.com: Wii MotionPlus: Nintendo Wii: Video Games
'Simple. Intuitive. Easy to use. Connect the Wii MotionPlus™ accessory to your Wii Remote™ controller to increase accuracy and enhance play control on compatible games. Look on the back of Wii Game Disc packaging to see which games are specially designed for use with Wii MotionPlus. Wii MotionPlus contains additional sensors that make the Wii Remote respond to the slightest movement, motion, or twist of the wrist. Wii MotionPlus must be used with a Wii Remote, which is sold separately. When used with specially designed games, Wii MotionPlus tracks players’ movements in finer detail and with greater accuracy than ever before, building upon the innovative wireless function of the motion-sensing Wii Remote™ controller. Even the slightest twist of the wrist or turn of the body is replicated exactly on the TV screen, allowing users to become even more immersed in Wii game play. Designed for easy attachment to the Wii Remote controller which is sold separately.'
Wii MotionPlus $16.98 at amazon FSSS Eligible 
