We belong to several state organizations and the cost is minimal -$25 - $50. By paying a yearly dues, they can keep their information on your farm updated and list you in their members directory if you so desire. Things change from year to year like phone numbers, or e-mail addresses. This is a good way to keep it current and help cover the cost of publishing a directory or other things like newsletters that they send to you.
Most associations have their membership fees coming due about now, so if you join now you get a full year. Numbers are just as important as money. Most associations don't get their money from the membership fees but from their annual fundraiser auction. So if you choose to donate to that as well you are only helping more.