Buy a CD, here is a list of vendors:
http://www.us.debian.org/CD/vendors/
Here in my country, I can get the 2 DVDs for 15€
If I were you, I would wait for the next stable release (Debian GNU/Linux 4.0); which should arrive in January.
Needs patience
Then, either you re-install or you upgrade by making your sources.list pointing to the cd/dvd player and change in the same file the "sarge" keyword to "etch" keyword.
and
apt-get dist-upgrade
(good luck)