Free or single license antivirus for Windows 2003?

[Deleted member 19858]

I also posted something similar in network and security but it might be better here. I need just 1 license for my server since I only have 1 and don't want to spend the money for 5. Symantec, McAfee, Panda, AVG, Trendmicro all only sell 5 packs and are quite expensive. Is there anyone else or any way to get these cheaper?