and if you don't mind driving a bit, in PA there is Shadeko, Alisaton, Cha-Rish, Dancing Star, Fitzmar. In MI there is Lyndobe, Gorrmae, Mi-Ti, Mi-Cher, Katy-Kid. In IN there is Windsong, Cambria, Angelic.
Check the DPCA breeders referral DPCA | The Doberman | Breeder Referral. You will find a pretty extensive list there. Just be careful, do your homework and ask loads of questions. In addition to good breeders, there are tons of puppy millish, backyard breeders in PA, OH, MI and IN. Since Dobes are not a particularly healthy breed, you really want to go with a breeder that health tests and breeds pedigrees with longevity.