A bunch of us are thinking on going on a cruise. Do you know any travel agent or web site that gives special discounts for large groups?
Usually the Cruise lines will give you a free cabin with every 8-10 bookings. You then could divide that cost as a discount. Here is a site with a wealth of information about Cruise Lines and their ships and itineraries.
Cruise Reviews, Cruise Deals and Cruises - Cruise Critic
Have a great time.