Ft. Lauderdale options include over 10 different cruiselines:
http://www.portevergladescruiseguide...-calendar.html
Prices range from US$409. per person (base price, inside cabin, etc. for example with Carnival) for 7 nights to over US$5000. (base price for top of the line ship, cabin, itinerary, etc. with Silversea).
Do you have a travel agent who can search put the best possible options based on your timeframe and budget? They don't cost anymore than booking on the cruiseships webpage.
Otherwise, you can use any one of many online cruise deals websites but you may never know if you are comparing cruiselines and prices correctly or completely.