There's a site I found that has a database of dozens of recordings of various Italian dialects and sub-dialects from most regions, except Abruzzo, Lazio, Emilia-Romagna, and Marche. They also feature minority languages like Franco-Provencal, Arbereshe, Griko, Gallo-Sicilian, Walser, Cimbric, Slovenian, etc.
Link here: http://www2.rz.hu-berlin.de/vivaldi/...d=0001&lang=it