Have you checked out the teaching resource from the American Classical League? They seem to have a great deal of postings.
For independent schools I found that a group like Carney, Sandoe (I know they cover New England and the mid-atlantic)--maybe they are national now . . . is another route to getting contacts.
Earn a $125,000 salary and join a team of master teachers at The Equity Project (TEP) Charter School, recently featured on the front page of the New York Times: (http://www.tepcharter.org/nytimes.php).
TEP is a new 480-student 5th through 8th grade middle school in the Washington Heights neighborhood of New York City. Applications are currently being accepted for teaching positions in Math, Science, English, Social Studies, Music, Latin, PE/Health Education, and Special Education.
About TEP Charter School
TEP aims to put into practice the central conclusion of a large body of research related to student achievement: teacher quality is the most important school-based factor in the academic success of students, particularly those from low-income families. In singling out teacher quality as the essential lever in educational reform, TEP is uniquely focused on attracting and retaining master teachers. To do so, TEP uses a three-pronged strategy that it terms the 3 R’s: Rigorous Qualifications, Redefined Expectations, & Revolutionary Compensation. For more information, visit us online at http://www.tepcharter.org
Compensation:
$125,000 salary + potential annual bonus, full benefits package