Or consider this option: if you really care about the living conditions and diet of the breeding stock, then buy from a serious hobby and show breeder. Then you can speak to the person who buys the food, feeds the birds, checks the health daily, and collects the eggs.
You can ask about diet and get detailed answers. You can ask about housing. You can ask about treatment and living conditions. The person you are asking will know the answers because they are the person who is doing it all.
Gotta say, though. It is not nearly as convenient.
This is what I've done. BYC has been a Godsend for that. I searched for the breeds I wanted, found out who had them, and sent emails until I found people who would sell me eggs or chicks. I understand people just starting out might not want to do it that way. It's is more expensive as well as less convenient, but in the long run, I think it's a better way to go.