One of the deals of the day on Bestbuy.com is this Logitech M317 Wireless Optical Mouse for only $9.99! You will get free shipping too!  This is $10 cheaper than I have seen on Amazon.

Scope out this deal by clicking the link below

Logitech M317 Wireless Optical Mouse

Information:

Advanced optical technology

For use on most surfaces.

2-button design

With scroll wheel for versatile control options.

Advanced 2.4GHz wireless technology

Provides fast data transmission.

Ambidextrous design

For comfortable left- or right-handed use.

Up to 1 year of battery life

With included AA battery. Low battery indicator light lets you know when the battery needs to be replaced.

Ergonomic design

With soft rubber grips enables comfortable use.

USB nano receiver

Allows for simple plug-and-play use.