Expect your search to last weeks if not months. You will be glad you waited when you finally bring that perfect bird home. That is absolutely not the case. Of course, large parrots can be stunning visually, and in the hands of an experienced bird person can make incredible pets. But be warned.
Larger birds cost much more to purchase and maintain.
They require heavily constructed enclosures that are bigger than most livingrooms can comfortably accommodate. The destructive ability of their beaks is formidable. And last but not least, these highly intelligent birds learn very quickly if people are intimidated by them, and without proper discipline become completely unmanageable. If you truly believe, after careful consideration, that a macaw or large cockatoo is for you, then follow your heart. Find a reputable breeder or pet store that is able and willing to hold your hand and bite the bullet.