Good start, Dave! My maternal grandfather raised parakeets as a side business. He easily had as many as 100 and more at a time!!! He also kept a garden to grow most of the seed for them.
My last year of high school, after my father moved closer to his job in another town and I refused to move with him, I had an apartment in one of my mother's friends... she also raised parakeets and cockatoos... she had a house in her back yard for her nests... she also had 100 or more of the parakeets and maybe 30 cockatoos....