As many of you know, VIPRE is my favourite and recommended anti-virus, etc. software. I think it does the job better than most, if not all competitors, and I've been able to run it on older computers with less memory than any of its competitors.
Until Sunday, it is $9.95 for a year. There is also a version with firewall, which I like most for its browser protection against known malware web sites, for $19.95. The multi-machine and multi-year plans are heavily discounted, too. For a total of $27.49 Canadian for both, a friend just got a two machine license on a lifetime (of the PC) license for the version without firewall.
http://www.vipreantivirus.com/
http://www.vipreantivirus.com/Promos/Black-Friday/