I had this sweet Action Comics #40 Signed by Siegel & Shuster on my watch list. It would have made a great early Christmas present to myself.
Sadly, the price went through the stratosphere. Hmmmm... gotta love those zero feedback users that came out of the woodwork to push this one up beyond all reasonable boundaries. Interestingly, the last "real" bidder topped out around what the book should go for... about $400.