Answer:
I am the tool, for inspiring many. Buy me in the store, for not much more than a penny. Don't overuse me, or my usefulness will go.
What is the freedom of birds and the pen of old men?
I have rivers without water. Forests without trees. Mountains without rocks. Towns without houses.
The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?
Dies half its life. Lives the rest. Dances without music. Breathes without breath.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.