@Matrix6
That is a one of a kind replica made by this guy:
http://volpinprops.blogspot.com/2010_11_01_archive.html
Here is the quote on how it was sold: "This particular replica will be auctioned off at the Child's Play charity dinner in Seattle on December 7th. Along with it will be a custom base signed by the guys at Valve!"
You cannot put a price on something like this =)