Obtain statistical data from governmental and private sources. Also, track down trade associations or non-governmental sources on number of people or households that would need this product. Would this product be purchased by an individual or an organization? A web search on your product or target audience combined with terms such as sales, units sold, even the word statistics may lead you to data. Or a search in a company database might find other companies that could purchase similar products.
Search by company or product name. Learn more about how their product is selling; are there recalls, problems or issues?