People have different ideas of what "reputable" breeders are. The majority of breeders are backyard breeders and not someone many of us who do their research would get a puppy from. Here are a couple of good comparisons.
Lawrence County Humane Society Abuse and Adoption Center Backyard Breeder vs. Reputable Breeder
If you look on the YTCA breeder's list, there are only a handful of breeders in each state.
What more and more breeders and puppy buyers are choosing is having your puppy carried in the the cabin. We have a member on another forum who works for Delta both she and her husband offer this service.