Go to the Edubuntu/Ubuntu webpage, follow the links, and get Canonical
to pop you a CD in the post - they do it free of charge ...

if torrents work for you . you can download them off a torrent , there are a
lot of ubuntu torrents !!

Check your local newsagent. I know at least 1 current computer magazine (APC)has
it on their cover disk.

You can download the Firestarter firewall through the Synaptic package
manager in Edubuntu.
http://www.fs-security.com/