Answer:
The cost of having a dog Spayed or Neutered varies and is set by the Veterinary Clinic. There are also other factors that determine the cost of having a dog spayed/neutered that include the dog's age, weight, and whether or not the dog has started their estrus cycle (had heats/going into heat (estrus)), and/or if the dog has been bred (had a litter of puppies).
In the U.S. most states and areas have Low Cost Vet Clinics to help ease the financial burden of having a dog/cat altered (spayed/neutered). You should be able to call your local Humane Society Shelter/Animal Services/Animal Control Office and ask for the number(s) to those clinics.
1oo or two