Linux from internet

linux is usually free, there are only a few commercial versions but most of them are free to download directly from the official site.. linux is open source licensed under GPL :) that's what i know

This is the site for downloading different distributions of Linux. I use Mandriva, but Kubuntu is highly recommended for users coming from the windows world as it is easy to install and use. http://distrowatch.com/ This site offers the CDs too, though if you have a high speed connection, just download it from the web site. Welcome to Linux world :)

I usually download the ISO file, its free.