Is there a trade association for your business? Who puts on the big conventions for the trade? Both types of organizations would be a great place to start. They have their finger on the pulse of the market and online businesses are now a big part of the distribution stream. You can also explore similar sites and talk to the owners. Each site has contact information. I think you will be surprised at the amount of data that is out there.
With many companies turning to content to help build their brand, some entrepreneurs and CMOs are looking at the wrong metrics. Here is how content-marketing has evolved and what people should be measuring.