Does anyone know where I can get the potentiometer that comes with the Arduino kit? You can see them here.
It's just any old trimmer pot. It's nothing special. Why do you feel you need that specific one? Any pot (of the right value) will do. What value is it? (That datasheet is a generic one for all values).
Visit your favourite electronics retailer (IRL or on line) and pick a pot that is a suitable value and jiffles your tipples.