Debian archives all it old distributions at http://archive.debian.org. In my case I needed the etch archives
deb http://archive.debian.org/debian/ etch main non-free contrib
deb http://archive.debian.org/debian-security/ etch/updates main non-free contrib
deb http://archive.debian.org/debian-volatile/ etch/volatile main contrib
deb http://archive.debian.org/debian-backports/ etch-backports main contrib non-free
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