£7.99 Microsoft Wireless Optical Mouse 2000 - Sterling Grey

Navigate with High Definition optical accuracy and wireless freedom. Work in comfort with this ergonomically designed mouse - with no software, it's easy to use and set up.

Comfortable in Either Hand : Use your mouse with your left or right hand - ambidextrous design makes it comfortable either way.

One reviewer did say that "This device has no ON/OFF switch so the mouse is always on, wasting batteries, and the receiver is by a wired USB which sits seperately to the PC. I do wish that Amazon would make such technical details clear in their somewhat skimpy product descriptions."

Note that it comes with a three year warranty and the battery life is suppose to last at least three months.

You can buy it from Amazon for only £8 including VAT and delivery.