Pinning down an exact cost for a Ridgeback puppy is rather tricky.
In the United States, the cost of a Ridgeback puppy varies from coast to coast. The cost factor is dependent on the local cost of living, the stud dog fee, cost of traveling for reproduction needs, the current price for veterinary care and the cost to whelp a litter. The size of the litter as well as any needed emergency care can also play into price. Also it is important to remember that the larger the litter, the more it costs to feed for 8 weeks before they go to their new homes.
For a Rhodesian Ridgeback puppy from a reputable breeder with health tested, champion parents you can very much expect to pay anywhere from $1500 to well over $3000 for a Ridgeback puppy. A Semper Fidelis Rhodesian Ridgeback puppy will cost between $1700-$2000 depending on many factors.
Most reputable breeders price all of their puppies the same whether they are male or female, show, performance or companion quality. They may give a discount for Ridgeless puppies or a puppy who has had a removed dermoid.
With a reputable breeder, you are getting a lifetime support system for your puppy, from health tested parents. You are essentially paying for the breeder, not the puppy.
When buying from a back-yard breeder you are just paying a high price tag for a low quality puppy from untested dogs. Who's to say in a year the dog doesn't need surgery for hip dysplasia, or begins to show signs of thyroid disease, or becomes deaf. These are the sort of things that reputable breeders try to prevent by completing health testing on their breeding dogs.
Remember that the initial cost of the puppy is only a fraction of what you will spend. You will spend over $1000 in food alone just the first year. That doesn't include supplies, training or vet visits.
See below for more information on the difference between reputable/responsible breeders and backyard breeders.