I really couldnt suggest buying from Petco, especially for your first bird.
I would look into a good breeder who has lots of time to socialize their babies, and that are syringe or spoon fed, not gavage fed.
Pamperedpeeps Aviary-* Eclectus, Solomon Island Eclectus
Plus Petco/Petsmart are often WAY overpriced.
To make sure its in good health you take it to an avian vet and have it tested.