Instead, you might want to start with a free seven-day trial of Norton Antivirus Plus, Norton 360 Deluxe, and Norton 360 with LifeLock Select. Norton also offers 50% off the first year, so keep in mind the annual renewal price could more than double. Antivirus Plus is the cheapest plan...
Norton 360 Deluxe provides everything you need to protect a Mac online but full scans are slow and things can get expensive fast with certain add-ons.