Chad pointed us to this article. One of the ten known copies of Action Comics #1 recently sold for a million dollars. Perhaps it’s worth losing so much floor and closet space to all of these long boxes… UPDATED: The day we posted this was the day Detective Comics #27, featuring the first appearance of Batman, sold for $1,075,500. Details here.
I found another link with more information.
Batman sells for more— more or less.