Answer:
Different states have different costs. Ask your vet.
However, declawing a cat is a highly controversial procedure, and more and more veterinarians do not offer the service. The veterinarians that still allow it consider declawing a "routine" surgery, while cat advocates consider it cruel, inhumane, and unnecessary in almost every case. Many countries around the world as well as some states in the United States have banned this procedure as it is unnecessary and inhumane.
If you know you want to declaw your cat, ask about the true facts about this procedure and the common side-effects on the cat (inappropriate toileting, biting, becoming overly nervous or aggressive, etc.), and what safer alternatives there are, such as buying cat activity centers, scratching mats and posts, training the cat to only scratch desirable surfaces, or even using caps called Soft Paws that slip onto a cat's claws.