the sources to main (ie. not non-free or contrib) debian packages are *always* in source on the mirror site...
mirror/binary-i386/admin/dump_0.3-6.deb mirror/source/admin/dump_0.3-5.diff.gz mirror/source/admin/dump_0.3-6.tar.gz (odd that the diff and tar are out of phase, but that could just be mirror skew; just grab the tar file, unpack it, tweak the dependencies and version (probably in debian.control) and then ./debian.rules binary, and you'll end up with an a.out-based package...)
