Toy Story optical mouse in store at Sainsburys only £5.69.
Cheapest delivered online price I can find is at Tesco online for -£9.97.
Other stores between £12-£20
* High resolution optical mouse
* Three buttons including scroll wheel
* Resolution 800 dpi
* Thin, soft cable with slim USB connector
* Ergonomic design
* USB - Plug n Play
* Compatible with Windows98 / 2000 / ME / XP / Vista / Windows 7