This site from the American Chamber of Commerce Researchers Association [ACCRA] provides a sample page from its most recent Cost of Living Index [COLI] report. Index categories include: composite, grocery, housing, utilities, transportation, health care, and other miscellaneous goods & services. Participating areas in Massachusetts include Boston, Worcester, Springfield, and Fitchburg-Leominster.
From the U.S. Bureau of Labor Statistics, the Consumer Price Indexes (CPI) program produces monthly data on changes in the prices paid by urban consumers for a representative basket of goods and services. Information can be found relevant to Massachusetts in comparison to of areas of the United States.
For more information please contact MassEcon directly.