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The best method is using sec edgar filings. You find the largest public company in your market and download the most recent 10-k's (annual report). They are publically available, you do not need to pay (although some sites make it easy for a fee). They always contain good market research and predictions for the markets, and are legally obliged to provide correct information.

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That's definitely a good idea when the company operates only in the market you are interested in. However, it doesn't work when the company has multiple revenue streams and doesn't break them out in their published accounts. In that case, if the company runs separate sites for each revenue stream, you can use Alexa (or similar) to get an idea of the traffic percentage to that sub-site and use it as a crude proxy for revenue.

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