In the form of a class action settlement, until July 16, 2004, you can get one of the following for free from
McAfee:
VirusScan version 8
AntiSpyware version 1.0
QuickClean version 4.01
...if you are U.S. redident (sorry to the rest of the globe) and owners of some older version of VirusScan (no proof of ownership required).