While many of us have free anti-virus software, if you do prefer paid (or Kaspersky in general), they have dropped the price of both their Anti-Virus and Internet Security software on Amazon.

Pick up Kaspersky Anti Virus with a three user license for just $12.99 on Amazon right now.  This usually retails for almost $60 and their previous sale prices have been around $15-18 so a great time to grab this.  Although it is the 2015 release, you will get free updates for one year with your license so while you will not get any new features they may include in 2016, you will get virus updates and stay protected.

If you prefer a more comprehensive solution to viruses, Kaspersky Internet Security is also on sale for $48.95 but will not ship until October 15th.  Both are eligible for free shipping from Amazon.ca but you would need to spend $25+ to get free shipping if buying the regular anti-virus software.