Hi, there. They are available through the Archdiocese of New Orleans Archives: http://www.archdiocese-no.org/archives/genealogy.php
I visited St. Bernard Catholic Church in 2010, before going to take photos in the cemetery across the street, and I was told the burial book for the cemetery had been lost in Katrina. I have ordered some burial records since then, so it's possible *their* copy was lost, or perhaps just the more recent burials.
Which Gonzales line are you researching? I have a Gonzales line from there, and I do a lot of research for St. Bernard, Plaquemines, New Orleans, etc. Maybe I can help. :)