If you want true show quality birds, contact an established breeder that isn't going to feed you a line of BS. If you want the caliber of bird ready to compete, expect to pay accordingly. You probably want to get birds that are 8+ months of age to get an idea of quality. Younger birds will be cheaper usually, but they don't always finish out decent. You can also go the route of eggs or chicks from a breeder too, but don't expect magical results. There are still a fair share of culls to weed through to get those gems.
First of all buy a standard of perfection and educate yourself as a buyer. Go to a few shows in the area and take a look at what is winning. Most of those breeders are usually willing to talk your ear off. Become a member in the breed association and they are usually great sources of information too. Fall is a great time to pick up birds since most breeders are narrowing down on birds before winter.