I expect to see one price for pet puppies (no breeding rights) and another for show/breeding homes (breeding rights). I don't expect that to change from litter to litter. Some litters, whether due to litter size, a c-section being required, health issues, a higher stud fee, etc., end up costing the breeder a lot more than others, and charging the same price for every pup kind of averages things out. Remember that most breeders aren't making much, if any, profit from a litter after all of the health testing, stud, x-ray/ultrasound, vet checkup, food, and show fees.
I do not like to see breeders charging more for certain coat or eye colors, sexes (for pets that will be spayed/neutered, anyway), or sizes in a litter.