Amazon has the Microsoft Bluetooth Notebook Mouse 5000 Mac/Windows for $19 plus $5 shipping.
Technical Details
* Enjoy reliable, transceiver-free wireless connection to your PC with Bluetooth Technology
* Microsoft High Definition Laser Mouse products are more precise, more responsive, and deliver smoother tracking
* You won't get caught with a dead battery the Battery Status LED Indicator glows red when the battery is running low
* Point and click in comfort ergonomic design helps you work longer without discomfort
* Use the Back button to easily navigate between folders and Web pages, or press the wheel for auto-scroll
Amazon.com: Microsoft Bluetooth Notebook Mouse 5000 Mac/Windows: Electronics
Microsoft Bluetooth Notebook Mouse 5000 Mac/Windows $24 Shipped 
