This mouse is originally $39.99 but now you can pick it up for only $14.99. This is a 63% savings.
Technical Details (From Amazon.com)
* Wireless: No Mouse Cord or Recharging Station. Longer Battery Life: Many users average more than six months battery life!
* 27 MHz Wireless Technology: The Microsoft smart receiver notifies you of interference from other wireless devices and leads you on how to reduce that interference.
* Smart Technology notifies you when your Mouse Battery needs replacing before you lose your mouse on those important documents.
* Designed by ergonomic experts for your comfort. Fits both Left and Right handed users.
* Tilt Wheel Technology: Makes it easier to scroll smoother and faster than ever with Side-to-Side Scrolling, Smooth Up-Down Scrolling, Enhanced Accelerated Scrolling, or Use the Scroll Wheel for Application Switching!
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Microsoft Wireless Optical Mouse 4.0 Mass Steel Blue