Unfortunately, 9.1 doesn't include pre-built packages, either on disc or via FTP. This isn't a permanent change, but an unfortunate side effect of the recent security incident. Hopefully there will be packages soon. Until then, you can build from source.
One way to work around this might be to use the stable packages. They'll be outdated, but should run fine. This will of course have to be done post install via the network using pkg_add -r. You'd need to set PACKAGESITE:
env PACKAGESITE=http://ftp.freebsd.org/pub/FreeBSD/ports/amd64/packages-9-stable/Latest/ pkg_add -r bash
for example. These won't be quite as new as release packages would be, but they should be mostly fine. Be sure to install portaudit, run it, and rebuild anything that has security updates.