The packgoat email list is a good resource. Make sure you let people know where you live.
Also, craigslist can bring local people around.
It takes a long time to develop a name for yourself and show people what kind of goats you have and develop a reputation for good goats. If you just have a few occasionally you won't get the prices that a person who has spent along time and lots of money developing an identifiable product and a good reputation.