Okay, I just realized you’re from St. Johns Canada, here’s one place
Capital Area Humane Society
Dogs 5 months and over = $150
Dogs 7 years and over = $100
This price is even better.
Low Cost Spay/Neuter The last one on the page, the others are FL.
St. Johns Animal Emergency Hospital Low Cost Spay / Neuter Clinic – Animal Emergency Hospital offers low cost spay neuter clinics as a community service for St. Johns County and surrounding areas. This service is designed for young, healthy pets. Older pets or those with medical issues, please speak with your regular veterinarian before scheduling elective surgery. Costs: Cat spay $55.00, neuter $35.00.
Dog spay $65.00, neuter $55.00. Call (904) 794-5071 after 5 p.m. to schedule spay / neuter for your pet.
I think as long as your vet says your dogs are healthy, you'll have no problem. Most breeders spay their breeding dogs at 5 or 6 for females and even older for males.