Answer:
I fly forever Rest never.
What dress does everyone have, but no one wears?
What room do ghosts avoid?
I have skin, more eyes than one. I can be very nice when I am done. What am I?
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I've told you all, I cannot tell you more. What am I?
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.