The mouse interface of choice is the PS/2 interface rather than the older serial interface. Using a PS/2 interface will not require the use of a serial port on your computer. There are a few types of mice available. The main choices are between:
Two or three buttons
Center sprocket wheel
The choice of two or three buttons depends on your preference and whether the software you run on your computer will support a three button mouse. If it does not support three buttons, it just means that you will not be able to use the third button. Many mice today have a sprocket wheel in the center which will allow the user to scroll up and down documents on the screen by turning the wheel. Also some mice are "ergonomic". I'm sure I misspelled that word.
Depending on features and the quality of the internal roller ball and mechanisms, a mouse can cost anywhere from $2 to $50. Or possibly you can find one in your back yard or basement for free.
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