Even for legal species, many states or countries require specific permits for exotic animals. Check your local wildlife and animal control regulations before searching for a breeder. 2. Sourcing and Cost Permit cost for pet raven in Missouri? - Facebook
Under the Migratory Bird Treaty Act (MBTA), it is illegal to possess, sell, or buy native ravens. Exceptions are typically only granted for licensed wildlife rehabilitators or educational institutions.
You may be able to legally buy exotic, non-native species like the White-Necked Raven from specialized captive breeders in some regions.