L.I.
You can google the following organizations and narrow it down to a teacher closest to you. You can also google something along the lines of: childbirth classes in Brooklyn New York to get classes that are closest to you. Typically these classes will be smaller and more informative classes than the larger ones held in hospitals.
http://www.motherstuff.com/html/midwife-cbe2.html
L. J. I., IBCLC
Lactation Consultant
Peoria, AZ
http://aabreastfeeding.com
Lamaze International
Bradley childbirth classes
ICEA childbirth classes