You can get Linux free by downloading from:
http://www.debian.org/
http://www.redhat.org
http://www.slackware.com/
http://www.suse.com/index_us.html

There are many other distributions available, all
with different audiences. Many are
available with printed documentation and applications
bundled (for a small fee), and are often available at
bookstores (online or not) and office supply stores.

There is lots more information at http://www.linux.org

You may also want to consider *BSD, which is also
available free. Info at
http://www.daemonnews.org/new2bsd/
http://www.freebsd.org/

>I've been told I will need a Linux PC for my firewall box and
>for my mail server.  I understand Linux is free.  Where do I
>get it?
>Gary

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