Consult with someone you know who is in a similar situation. Use their successes and failures to expedite your search. Most people are glad to share their experiences to help someone else. And your turn to help may come later. Send for pamphlets, track down magazine articles.
Every organization has a bulletin or newsletter.
Let them know what you need, whether it is information or a service or something really unusual. Don't get discouraged. If someone cannot help you, ask if they will suggest someone who can.