Linix is free, but it still costs money.
You need a computer, need a CD, need other HW.
You need a Distribution CD
And a little time.
Shure, you can just get it over the Web ... and pay $$$
just for transmission ... and the needed time.
And after thet you need time to install ...
TIME IS MONEY.
Linux is free but not without cost.
** OR **
You could get someone to burn you a CD copy, or find someone willing to
give away their old distribution CD. I was able to get a copy of RedHat
5.1 burned for $5. I'm sure you could find someone fairly easily who
would do something similar.
I ran across a web page that listed people with old distribution CD's who
would either give them to you or let you borrow them.