Aquascaping resources driftwood to rocks

Important part of my aquascape design that shapes my creation is driftwood and rocks.
I'm always keep an eye out for a nice driftwood or rock collection.
I search takes me to only LFS and wholeslaes around the NYC area at this time.
I have not comb the beaches or gone to any country side to find natural resources yet.
So anyone know of any good resources like there backyard to garden centers to find the prefect piece.