I would look at Champdogs website, and find the breeders on there. Then you can contact them directly. Even top breeders often have young adults that they like to rehome, free, though with constraints on breeding and showing.. Also you can keep an eye on the rescue sites, though I agree that many of them have issues.
I adopted a top breeders’ springer, turned out she had an autoimmune condition. Then we bought very classy puppy Bobby, fully tested, who had severe guarding issues, and passed away at eight years from a kidney condition. My sister in law has a gorgeous one , with dry eye. The point is that you don’t know what any pup will develop, top breeders or not. I can only say , much as I love spaniels, my rescue mongrels are the healthiest dogs I’ve had.
I think if a good breeder has pups, they will sell them at the going price.