Answer:
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.
I can be written, I can be spoken, I can be exposed, I can be broken.
I grow where no flower grows, where no light touches the walls, up or down, that I don't care, was here before people were.
Men have one, women two, and when they become family, itβs three. What is it?
Though blind as well, can lead the blind well.
People take me on walks and I run and have fun. What am I?