The cheapest I have found is ABC clinic. And if you watch specials they often have feline specials. If you are looking to get it done right now though ABC is going to be your cheapest option
If you can get a hold of them. I have 3 male cats I wanted fixed when ABC clinic had a special going on. I called and no one answered the phone. I went online to register them and it says that if it's a special to call and make an appt. I work weird hours I can't keep calling.
There is a place in Michigan that does it based on donation or basically what you can afford and it includes shots. It may be cheaper to just do it locally but you could look into it. My family live in the country and people drop off cats all the time, sometimes one will stay and if it does they take it in for spay or neuter and shots. I think my aunt paid 30 dollars each for the last 2 she took over.
Abc Animal clinic
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