Some cruise sellers say "port fees extra." Sometimes those charges are more than the full retail cost, similar to marketing strategies that advertise a low product price paired with exorbitant "shipping and handling charges" that are really meant to cover the cost of the item as well.
Where can one find out what those costs actually are, for any given port/route, especially those in the northwest quarter of the globe?
An ideal answer would cite information from whomever it is that charges the port fee, such as a governmental port authority. A board where other passengers post what they were charged would be useful as well.
Edit: Some answers say that certain cruise lines include it in the cost of their fares while others don't. For the ones that don't list it separately on their websites, are there ways to get this information for someone who's considering purchasing through a reseller (e.g. as part of a package)?