American Society of Appraisers is the largest multi-discipline appraisal association. Appraisal Institute is the largest appraisal association with about 20,000 members. Many classes offered through local chapters . Call the chapters directly. Internet and National courses on the main web site.
Some classes have state appraisal recertification approvals.
National Association of Independent Fee Appraisers - very active on the East Coast and Midwest. Some chapters in other parts of the country. Has an affiliated school, Lincoln Graduate Center. Internet and live classes. 2015 Clement Ave., Alameda, CA 94501.