Instructions
Get some up-to-date books, or do other research to learn about the various cockatiel mutations (colors and breeds), and what goes into their care and feeding. Cockatiels require a lot of love and attention, make sure they're the right bird for you before you buy.
Make sure there is an avian vet in your area before buying a bird. Birds are delicate and can require special care that a standard vet may not be able to offer.
If possible, get a young bird that has been hand fed. It will make life easier when it comes to training and bonding. If you adopt or buy an older or pre-owned bird, just know that they will take a bit more time and attention than a younger bird, especially if they have not already been hand trained.
Only buy from a reputable pet store or breeder. Look at the conditions of the area the birds are kept. It should be clean, and the birds well cared for. The birds should not be in terribly close quarters, and should have clean food and water. Ask friends and family for recommendations on a good seller.
Keep in mind that male birds are more active and require more work than females. Females are good if you want a docile pet that will be very loving and submissive. Males are best if you want a bird that will like to play and may learn to sing and speak. Both make great pets, but males usually take more time and attention.
Make sure the bird is healthy. Baby birds will look rather scraggly, but when old enough to sell, they should not have any bald spots, no discharges from the nostrils or eyes, and their feet should be pink and not crusty. The exception to the bald spot rule is Lutinos. They will have a small bald spot on their head, behind the crest. However, the spot will be small on a well-bred bird. A large bald area indicates too much inbreeding.
Go to multiple stores/breeders when possible, and look at the birds in each place. Pick a bird that has the personality you like. If the birds are in cages with enough space, you should be able to watch each bird to see who's active, who's quiet, etc., and pick a bird that suits you.
How to Pick Out a Cockatiel
If you're looking to buy a cockatiel as a pet, there are some things you should know beforehand. Read this article for help in picking the perfect bird.