If it's anything at all, it'll be some line you probably never heard of. The cruise will be a "gambling boat" most likely. If it does happen to be a cruise line that you've heard of before, the taxes and fees involved will equal or surpass the total cost of the cruise if you went to a T.A. and bought it, and you won't be able to select the date you want to cruise,,,they'll do that for you!
Don't walk away,,,,RUN!