ESET Nod32 Antivirus 5, 1-User for $9.99 shipped after this $20 rebate. Here is a screenshot before the $20 rebate for your reference. This antivirus software features award-winning ThreatSense engine. It proactively detects and eliminates viruses, trojans, worms, adware, spyware, phishing, rootkits and other Internet threats, and was awarded the “BEST Antivirus Solution” in 2007 and 2008 by AV-Comparatives. Most places have it for about $39.