News & magazine articles, blog posts, trade magazines and other journalistic sources can help you identify research organizations that are likely to have data.
See this example of a New York Times op-ed article on salmonella and antibiotics. In just a few paragraphs it mentions four places to look.
Kristof, Nicholas. "Cleaning the Henhouse." The New York Times Late Edition (East Coast). New York, N.Y.: Sep 2, 2010. pg. A.35 Accessed via ProQuest Newsstand.