Where to find cheap, quality dogs?

I want to set up a store in the future to sell dogs and cats that I’ll breed (I know people think that a lot of owners go to shelters but really only 19% of people get them from there, and I donate to shelters all the time so no negative comments please!). I only want to buy the starting dogs (have to be healthy!!) so that I’ll know all the puppies are in great condition when sent out to hopefully their forever homes. anyone know a breeder who will be breeding for years to come and doesn’t sell for ridiculous prices, i.e. $1000–2000! puppies are wonderful and do take some time to work with but really most want a bigger profit when they should be selling those larger breed dogs for 250–500 like smaller ones.