jet,
We have done groups on
DCL and
RCCL, as have many other agents. If you have 8 double occuapncy cabins, you can qualify for a "free" cruise fare (cruise only, not port charges, taxes, etc) . Depending on the date, some agencies may already have group space reserved. The earlier it is reserved, the cheaper the price. For instance, we have group space on the June 26, 2004 7-day Magic cruise. As the dates get closer, the price goes up. Other amenities may be available, it really depends on the dates desired. I know that 2004 group space, especially during non-school seasons, is full for many dates. That doesn't mean the ship os full, just that DCL is not accepting any more group allocations.
Send a PM if you would like more info
Good Luck
mac_tlc