You can check with your local rescue organization or even Petco, they can help you obtain lower cost spayings and advise you of where the low cost clinics will be. Your local Humane Society may even provide you with a low cost spay certificate to be used at one of your local veterinarians.
For other low cost options with help locating programs in your area, click here
One of these options should work for you.
Cat Care Expert
20+ years experience with Cat Care and behavior problems, 3 years Pet Rescue