Check out Meyer hatchery. They are sold out of Black Copper pullets for the season, but they still have a Marans assortment with a bunch of varieties still available with a bunch of dates for sexed pullets. Cackle still has sexed Black Coppers available. Both hatcheries do small orders.
My local feed store, actually called Cascade Farm and home has Moran's. I don't know if they are the black copper ones or not. But it seems like a Feedstore over there would have them. Feed stores just get them from hatcheries.