where to find a linux-image-2.6* package?

[Andrew Schulman <andrex@alumni.utexas.net>]

Where can I find a linux-image-2.6* (or kernel-image-2.6*) package for
amd64?  I've put

deb http://debian.csail.mit.edu/debian-amd64/debian/ sarge main contrib
deb http://debian.csail.mit.edu/debian-amd64/debian/ sid   main contrib
deb http://mirror.espri.arizona.edu/debian-amd64/debian/ sarge main contrib
deb http://mirror.espri.arizona.edu/debian-amd64/debian/ sid main contrib

into /etc/apt/sources.list and run apt-get -o APT::Architecture=amd64
update, but then apt-cache search linux-image or apt-cache search
kernel-image give no results.

I want to install a generic 64-bit kernel in order to complete my
installation of amd64 using debootstrap.

Thanks,
Andrew.