The Nintendo Wii Wheel accessory for Mario Kart is being pushed aggresively. Already retailers have slashed prices to USD $9.99. Personally, this doesnt come as much of a surprise. The Wii Wheel itself is just a plastic accessory making it easy to duplicate at a fraction of the cost.
Retailers obviously want to gain as much as possible before the Wii Kart takes off bringing more interest from duplicateers.