For example, the resources diplomats use for language learning are public domain http://www.fsi-language-courses.net/
FSI courses usually have a lot of audio if that is what you are looking for in Pimsleur. FSI is just one of the many good free resources out there. If you pay anything for it, Pimsleur is a scam and just plain inefficient. You can do much better for yourself by finding the 2 or 3 free and high quality resources that suit you best.