Keep in mind there are three components to the remote key.
The remote, the key blade and programming. If you simply need a spare key, you can buy a Master for about $125 at your dealer. The master does all functions fine but has no remote features.
If you simply need the remote, you can reuse your blade. You will need to have the remote programmed by the dealer.
If you need the whole shebang, the above posts are on track.
Good luck.