Geri Mets is a professional pronunciation teacher. She not only demonstrates the correct way of saying a passage, but explains the differences in sounds between French and English She gives a free class once a month that is well worth while. “pronouncingfrench.com”.
Another good source, although not for beginners, are some of the courses on the free French MOOC site. Every so often they have pronunciation courses from the University of Toulouse. Their site is “FUN-Mooc.fr”