I thought on this some more and have a few additional suggestions.
There is a difference between facts (dates, numbers, when someone was born, etc...) and processes and experiences, (how to fly an airplane, what if feels like to be on the top of Mount Everest).
For processes and experiences I recommend the following:
Experts: Most colleges and universities have a list in their Public Relations Departments of all the faculty who are willing to share a quote or expert information to the media. They distribute the list to the local media so that when the media needs someone to comment on for example, why jelly beans are falling from the sky, they can ask the jelly bean expert for a quote or news clip spot. I am not sure if this list is shared with outsiders, but you can try.
Association leaders:
If you use the Encyclopedia of Associations, you can find the associations for everything from the AMA to the Association of Jelly Bean makers. You can contact the association and they can connect you to someone that may be willing to share their expertise.
Government agencies, reports and documents:
Search Google and type :gov after your search statement. For example:
jelly beans:gov. Your search results will include only sites with .gov in the url.
Libraries:
There are thousands of Special Libraries that can connect you to primary resources and perhaps experts. Use the ALA Directory (American Library Association) to find an alphabetical lists of libraries in your state.
http://books.infotoday.com/directories/American-Library-Directory.shtmlMost public and academic libraries have this print source. I think there may also be an online version.
Depending on your topic, an expert may be just about anywhere.

I hope this helps.