Buy.com has a Kensington Wireless Presenter for $9.98 after $10 discount using Google Checkout and $20 rebate with FREE Shipping.

• 2.4GHz wirelss technology delivers worry-free roaming  
• Control presentations from anywhere in the room -- up to 60 feet away  
• Wireless receiver stows inside controller body for carrying convenience  
• Intuitive 4-button design features one-touch start 

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