Free
Atlas of North American English. Book and CD-ROM. Phonetics, Phonology and Sound Change by William Labov, Sharon Ash and Charles Boberg
Print List Price: £679.00
http://www.amazon.com/gp/product/B00ADEPV52/
http://www.amazon.co.uk/gp/product/B00ADEPV52/
Whether you get the CD-ROM audio is another matter