There is an atheist speaker's bureau. These boys are serious.
American Atheists Speakers' BureauEducating For Reason, State-Church Separation and Atheist Civil Rights...
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The American Atheists Speaker’s Bureau provides outstanding lecturers on a range of topics of interest to nonbeliever groups and other organizations. Whether it is a debate or presentation format, our Speaker’s Bureau can help to make your organization’s next meeting an exciting and informative event!
FEES AND HONORARIUMS American Atheists will try to work with you in providing a speaker for a reasonable cost. This can factor in related expenses when appropriate, including travel and reasonable per diem, and other associated costs. A suitable honorarium is appreciated from institutions.
TOPICS OF INTEREST Whether it involves a philosophical subject, strategies for defending the First Amendment or political developments, The American Atheists Speaker’s Bureau will help to find and deliver the appropriate presentation for your organization.
http://www.atheists.org/about/speakers_bureau