I'm always on the move and tend to take my laptop wherever I go. I end up spending a lot of time waiting around for classes or at work, so having a mouse for these periods of extended use of my laptop is a must.
I decided to shop around for a cheap, yet usable mouse. My main requirements were the mouse being wireless, portable, durable, and nice-looking. I found this mouse on a website called TMart.com. Originally about $9, it is now on sale for $7.63 with free shipping.
I received the mouse in about three days through USPS and was pleasantly surprised by the mouse itself. Despite it feeling a bit plastic-y, it's lasted quite well in my backpack the past couple of days going to and from my office. Clicking and tracking speed is smooth and configurable through your system. The optical laser is very good – I was able to use it both with a mousepad and straight on my wooden desk. The USB adapter is tiny and sits close enough in the port to stay out of the way, but at the same time is easy to pull out when needed. There's a convenient little slot on the bottom of the mouse itself to store the USB adapter.