Answer:
I am filled with garb the price is free. Just return what you don't need.
What goes up but never comes down?
I am a cave full of bones and the house of a worm.
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. I have greatest power when given away yet lust for me keeps me locked away.
I am merry creature in pleasant time of year as in but certain seasons I sing that you can hear; And yet I'm made a by-word A very perfect mock; Compared to foolish persons And silliest of all folk.
What language does a billboard speak?