A colleague just brought to my attention that the language courses used by the US to train foreign service workers are now free online (FSI Language Courses).
As stated on its web site:
“These courses were developed by the United States government and are in the public domain.
This site is dedicated to making these language courses freely available in an electronic format. This site is not affiliated in any way with any government entity; it is an independent, non-profit effort to foster the learning of worldwide languages. Courses here are made available through the private efforts of individuals who are donating their time and resources to provide quality materials for language learning.”