Ask the question:
What organization or agency would likely collect this data?
Government Agencies collect data at all levels to aid policy decisions.
It is generally distributed free via the internet.
Many national and international organizations such as the United Nations, OECD, World Health Organization, National Health Institute, American Heart Association, and World Bank compile and distribute data both free and fee based.
Commercial Subscription Services?
Boston College purchases major data sets for use across disciplines. Larger data sets are generally available in SPSS, Excel, SAS or Stata formats.