You really need to call them and ask.
It will depend on several things you would want to call them for a price estimate.
They wouldn't be able to help with that. Only good for shots and meds. They will give you suggestions tho which might be helpful which is at no cost
They would probably have to do a physical exam of your cat first to get their own assessment and determine or confirm that it's actually a stone. I think a full physical assessment is about $90-ish (and I cannot recall if that was including blood work or not). My cat sees Dr. Meyer there and she is amazing! I thought my cat had a UTI and she did a physical exam and blood work and determined it was hyperthyroidism and with medication, she's doing well!
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