Hello. The best free resource I could find is the Bureau of Labor Statistics page on Consumer Price Index. There is also the ACCRA Cost of Living Index, but that requires a paid membership, which the HS/HSL does not have. If you ask the Law Library, they may have access to that.
Here is a list of resources from the State department: http://www.state.gov/m/fsi/tc/79700.htm
And the Department of Labor's page, with databases and resources: http://www.bls.gov/cpi/home.htm
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