All the Regional Newsletters list job openings..that is, all six of the
AAM regions. Also, most all the other professional museum-related
organizations have job listings...AASLH, ASTC, CAA, AYM, and on and on.
Some Arts Councils and Humanities Councils list position openings too.
The Council of Higher Education and the Museum Anthropology group of
AAA are other possibilities. Check the front of the Official Museum
Directory for listings of other organizations.  Good luck!