Head shops near Bethesda (or DC)

Hey, just trying to find out if there's any head shops in the area that I am not aware of. I know of the lot in Baltimore but that's too far. There's one in Georgetown that sells pieces.

How about Kensington? I remember hearing there was one around there...

Mont Co its against the law and the store can be fined, but if you look real hard you just might find in a dot head store if you ask