  50 pound salt block.  
This 50 pound block of salt cost $4.99.  That's right, 10 cents a pound retail for something once so valuable that the very word salary derives from it.  In solid block form salt like this is meant for licking by cattle.  It's called a salt lick and you get them at farm supply stores. 
Source: Farm & Fleet 
Contributor: Theodore Gray 
Acquired: 28 February, 2009 
Text Updated: 1 March, 2009 
Price: $5 
Size: 12" 
Composition: NaCl
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