Hello! I am looking for stones for a dry stream bed for our client's home in Connecticut. My boss saw the larger stones in the photograph shown here, in a little garden outside an apartment house on Central Park South. She would like to get similar flat(ish), grey stones for the dry stream bed. She says that the stone is around 7" - 8" long. I would love to know where we could purchase these in the NYC, Westchester, CT, or even Long Island area. We need enough for 300 sq feet.

Thank you so much for any ideas you have.