I am on the border of Mass and Connecticut, and got the Mallards in CT. I went to the one near me in MA and they also had Mallards, but our state has a minimum purchase of 25 ducks. Another feed store had a listing on CL for Campbells but was already sold out, only had white Muscovies. He may get some next week or the week after. Are ducks like chicks in that you want the ages really close or will a week or two not make a difference?