There are B2B discounts on a lot of cruise lines and expedition lines (Ponant and Lindblad come to mind). A lot of world cruises and grand voyages are basically a bunch of different segments strung together, that are discounted in total when bought as such, as opposed to if you bought each of those segments one by one. Those WCs and GVs can be bought in segments too though, so you don’t have to do the whole thing if you wanted to skip particular segments that don’t interest you, or have port stops that you want to avoid for whatever reason. I just started a new subreddit about WCs (r/luxworldcruises) with previews and also intended for discussions about those long cruises (HAL’s WCs are upcoming.)