Logitech Wireless Mouse M325

This mouse is, by far, my favorite wireless mouse.  It has a super long battery life (although I have the habit of turning off my mouse when I'm done using it for the session) and a tiny little receiver that plugs into a usb port. The receiver is the masterpiece. It is a unifying receiver that can connect up to 6 other unifying devices (think keyboards!). This has been my go-to mouse with my laptop, not just for portability, but also using it as my main mouse with my desktop computer.

I found that it was cheapest to purchase from Amazon: http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Logitech+Wireless+Mouse+M325.