Titanium hammer. 
Hammers are sold by weight.  A hammer that isn't heavy enough can't do the job no matter what material it's made of, so hammers made of a very light metal like titanium simply have to be larger.  Is there a point to using an expensive light metal to make something that is defined and sold by weight?  If there is, I don't know it. 
Source: Farm & Fleet 
Contributor: Theodore Gray 
Acquired: 22 April, 2009 
Text Updated: 23 April, 2009 
Price: $80 
Size: 5" 
Purity: >90%
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