You can also download just the
boot floppy image,
the root floppy image, and the
network drivers floppy ... then download all other items via an ftp or http install...but that would take longer than the ISO install ... (you will have to download several items via the web even after the base install from the installer... like X-Windows, Gnome/KDE, OpenOffice, etc...but the base installer (that is 100mb) has compressed files that expand to about 300mb ... a GUI workstation install is close to 2.0G). There are no Debian Sarge install disks right now (except the 100mb installer)
Sarge is not on the 3.0r2 (Woody) install discs ... the standard way to get sarge (other than the installer) is to install woody and then edit your /etc/apt/sources.list and change all references of stable (ie woody) to testing (ie sarge) then download all sarge packages using dselect or apt-get ... which actually takes longer than the sarge installer install.