You have to pay two separate court fees to get a divorce. It's $210 to file the first documents (a $200 filing fee, plus $10 for a Registration of Divorce), and then $80 to file your Final Application. If you decide to get a Certificate of Divorce, that's another $40. (There's no tax on these costs.)
You don't need to get a Certificate of Divorce when your divorce comes through, but you'll need it if you want to get married again. You can order a Certificate of Divorce any time you need it after your divorce has been finalized.
There are a few other costs you should know about. If you get your Affidavits sworn at the court registry, it's $40 for each Affidavit. If you don't have a certified copy of your marriage certificate or registration of marriage, you'll have to pay to get this as well. These are only court costs. You'll need to pay to get a process server to deliver your documents or to get your documents sworn anywhere other than the court registry.