Give the Cambodian course a try for free!
(with MP3 audio and PDF text)
This course teaches the standard dialect of the national language of Cambodia as well as the most important secondary dialect of Phnom Penh. The standard dialect occupies a central position among the dialects and corresponds more closely with the writing system than any other. The dialect of the capitol, Phnom Penh, differs sharply from the Standard in phonology but not appreciably in other respects.
This the Digital Edition, with MP3 audio and PDF text.