Birds from a breeder or a pet store most often do not carry diseases that can harm you. Not only does it cost money to buy a bird but it also costs money to keep a bird. Birds can live up to 60 years so you should be prepared to buy supplies for that bird for the rest of it's life. I don't say this to intimidate you. You will have many happy days with your pet but it does take a lot of responsibility.
Birds require lots of supplies.
And most of all. . . . . . . . . . . . A cage needs to be a sturdy one that will not break under the pressure of the beak. An ideal cage would be a metal or wire cage that is includes 4 important features. One is a perch. A perch will allow birds to hang on to something so they can reat and relax.