Last Minute Cruises Out of Galveston?

I have heard that you can get great deals on last minute cruises going out of Galveston, and since we are so close, would love to take advantage. Does anybody know of HOW to find out about these deals? I have googled "last minute cruises" etc., but there must be another place to learn about these. Thanks advance for any directions!

I would go straight to the Royal Carribean or Carnival websites or call them directly. I have taken the Ecstacy out of Galveston and enjoyed it.