I am also taking mine through the North Shore hospital/LIJ health system. If you google "North Shore Birth Classes" the site should come up. They offer a few different baby classes.
I asked my OBGYN and he gave me the contact info at Winthrop Hosp since that's where i was delivering my son.. Back then (2009) we had to pay $150 or something like that but they were great and VERY helpful.
Re: lamaze classes in nassau