Yes there is not point of have Antivirus on Linux, unless you are dual booting wih windows or having shared by LAN a windows partition, the viruses could pass. Apart of that is useless Anyways There is also an open source CLI antivirus for Linux apart from the propetary ones (AVG, Avira) it's called Clam, available on most Linux repos, there is also a GUI called Clamtk for it
as well as i know linux is a self antivurus creater but for it ablilable anti virus is TurboLinux is best way which do I use.
Instead of getting free anti virus you should prefer to but it is the matter of security of your Linux system!
