U.S. industry data from which to derive market size estimates
Association Websites from a specific industry
May provide free snippets of research on its members and the overall industry under "research" or "statistics." Try an open web search like:
[industry description] + association
Providing global coverage to comparative business statistics in a clear, straightforward manner, providing an overview of international companies, products and services. Each entry features a descriptive title; data and market description; a list of producers/products along with their market share; and more.