It's sad when people only try to get the best deal. I love that you went with the higher price for healthier birds

A lot of backyard breeders here sell birds for inexpensive. You'll find hand raised galahs for 800-1,200 with birds who are often eating seed and breeders who know little, when they sell from a good breeder for 1,500 to 2,500.
Price does not always mean better quality either. In this case it was a choice between petshops, petshops always jack up the prices.
For example... here is a quality victorian breeder and handrearer of Alexandrines...
Alexandrine Parrots Hand Raised For Sale Melbourne Australia
They sell their babies for $450 for girls and $495 for boys.
Most pet shops sell for $600+, but you are just buying a bird the breeder couldn't sell privately. Buying from the breeder that sold that bird to the pet shop you would pay $350. If you are buying from a pet shop you are almost guaranteed of getting a bird that wasn't wanted by anyone the breeder could sell to privately so supplying the pet shop was the next best choice. In qld the prices I quoted are prices from the most reputable breeders in s/e qld. These are DNA sexed and health tested babies, you can see the parents and meet the breeder who handreared the babies from the start... they don't offload bubs to petshops and keep them if they do not sell...there is no doubt they are quality.
You could get one for $200 from a breeder who would allow you to finish the handrearing of the baby to save money LOL Which is illegal in most states

300-400 is the price for a quality bird in qld. And a difference of $500 is a big difference.