Only a pet shop is set up to do this. The demand is weakening because the pet shops are not selling their clientele on the idea of owning a bird since they no longer stock them. Pet shops throughout the United States continually complain to me about how they invest hours of their employees' time in selling customers on bird ownership, only to have them buy directly from breeders through the newspaper. They find out about this when the client returns to buy a cage and supplies. Unfortunately, displaying cages and bird food in pet shops does not create a strong demand for birds.
Wise breeders realize that, in many ways they are partners with the pet shops that sell their birds.
The best advice I can give you is create a co-op. Get together with several other breeders who are having the same problem you are. Pool your resources so you can afford to advertise in the national magazines. This will enable you to market your birds in areas that have not been hit so heavily by direct sales. At the same time, I would approach some of the local shops you feel you can trust.