You can buy most Linux distributions on CD.
My advice to you is to check the
Linux hardware compatibility list, before spending any money on Linux.
I have never downloaded anything as big as Linux before as I only have a 6K/second connection and it auto disconnects after 2 hours. (This has fuck all to do with my settings my ISP disconnects me) The biggest file I normally download is openoffice (about 75MB) it takes just over 3 and a half hours.
My advice to you is use a decent download manager, get one that will pause if you get disconnected or there's a power outage, and download Linux when you're not using you're PC, do it overnight, do it in stages it may take a few days or even a week or so but you'll get there in the end.
[ July 20, 2004: Message edited by: Aloone ]