Many RPM packages are available at:
ftp://ftp.redhat.com/current ftp://ftp.redhat.com/contrib ftp://ftp.redhat.com/non-free
Once you are connected to ftp.redhat.com you can also search for a particular filename. If I was looking for a kermit RPM I would enter:
site exec locate kermit
and the system would display the location of the kermit RPM.