Looking for a Chinese language teacher? Or a job? A good place to place a job announcement is through the Chinese language department of colleges and universities, particularly those that offer teacher education programs and certification. A good resource is a list of such programs compiled by Tianwei Xie, Cal State Long Beach, on his website (scroll down a bit to see univeristy listings).
Also consider ACTFL Career Center, where employers and job seekers alike can post information online. Also see the website The Association for Asian Studies Job Board. Although access to the boards is a member priviledge, it is an excellent organization for your target audience.
Another good option is to utilize a visiting teacher program to place a Chinese teacher from China in your school. Three programs worth investigating are