Where can I find a place where I can adopt/buy German Shepherd Puppy in Brooklyn NY Area?

My baby of 18 years just passed away yesterday. Ironically, we made it to the vet just in time for her to "leave" on the table. She had an inoperable tumor and was 18 years old. Im looking for a German Shepherd specifically because thats what she was. Now no one can ever replace her memory, I can only replace the void she has left in my heart of her physical absence. The vet was actually surprised that she lived that long. I was only 4 when I got her. I am 22 now. So I guess thats good. Anyway I need some good places where I can adopt OR buy a puppy. I am using petfinder.com and the internet to look. The reason why I say puppy is because I have other little animals (3 small dogs, 2 chiuahuas and a pekingnese) around the house and I have a good handle with German sheps when it comes to training them. So I cant have an older dog killing my other little ones and the older ones are harder to train (I know from personal experience). Hence why I prefer a puppy. Please post links/advice/anything that you think is helpful.