Watch the tutorial on secondary research using library tools.
Research on almost any topic should start with industry reports for a basic understanding of a project's context.
Trade, industry, and professional associations can be a great source of information. Depending on the association it might have data available on its website, or contacting them might result in good leads. A search in Google is the easiest way to identify associations.
Tip 1: Unlike industry research, market research firms specialize in different areas. One may not cover your industry at all, another might be the expert.
Tip 2: It's hard to find secondary research on innovative or niche markets. Try to think of a proxy--an analogous product, use case scenario, or target.
Tip 3: Look for reports on your product category, but also reports on your target. A 200-page report on the American Mother may not mention your product category, but if that's who you're targeting, it will likely provide valuable insight.
The line can be blurry, but industry research focuses on the industry size, outlook, and structure. Market research adds an emphasis on branding, trends, and consumer behavior.
Industry research is usually shorter; market research is longer and more likely to include original research. Market research firms typically specialize in certain industries. For these reasons, a high-quality industry report might be 20-30 pages and cost $1,000, while a good market research report might be over 200 pages and, depending on the industry, from $4,000 to $15,000.
If you're in a position where you need to buy some research, you can save money by buying older editions of reports or by contacting publishers and negotiating single chapter or page-by-page purchases. Just remember if you see a cheap report: you usually get what you pay for.