"Microsoft's most portable wireless notebook mouse that connects directly to a Bluetooth PC without a transceiver, freeing up USB ports for other devices."
Shipping : from $10.
Product Description : Microsoft Bluetooth Notebook Mouse 5000 - mouse
Device Type : Mouse
Orientation : Right and left-handed
Connectivity Technology : Wireless - Bluetooth
Movement Detection Technology : Laser
Buttons Qty : 4
Movement Resolution : 1000 dpi
Features : Scrolling, High Definition Laser Technology, battery indicator
Battery : 2 x AA type
OS Required : Apple MacOS X 10.2.6 or later, Microsoft Windows XP SP2, Microsoft Windows Vista
Package Type : Retail
Manufacturer Warranty : 3 years warranty
$32 at umart - or many other places