In terms of conventional cruise ships, what it doesn't cost is the brochure rate.
Brochure rates are like the sticker price of a car - only a figure upon which to base discounts.
Except for sail boats, river boats, vessels for nature lovers and a few luxury vessels, you'll find discounting the norm today. Carnival Cruise Lines recently said its prices are at 1983 levels - a good indication of what bargain cruising is today. The price of a cruise varies by ship, sailing season, length of voyage and category of cabin selected. Cruise ship cabins vary by their location on the ship and special features offered. For example, a suite is larger and more expensive, as is a cabin with a private balcony.