Getting a Pet Bird

Hi, I really wanted to get a pet bird like a cockatiel, but a big problem I have had is the prices of the birds. I know that stores like PetSmart are terrible, but they provide these birds for a lot cheaper, and I was wondering if this would really impact the bird and their relationship with the owners if you choose the bird carefully and train them well. If anyone who has gotten a bird from here could help me, it would be great. Thank you.