Declawing a cat usually costs between $100 and $250, depending on the veterinary or the procedure. However, it is important to consult your veterinary first because it is done as the last option. Many states have banned the act naming it as inhumane. For more details, go to http://pets.costhelper.com/cat-declawing.html.
Loise is correct. But its really not a big deal to get her declawed. Yes it is "cutting" their toes basically, but its no different then a human having to have a surgery. Your cat will live. Just make aure that you do everything they tell you to keep infection out because that is bad.