Hi there! I got a rough of idea of what to expect by reading the following (very long) thread about port upgrades: http://www.disboards.com/showthread.php?t=3009010 The price will be dependent on how much availability there is, the time of year (peak season or non-peak), and probably other factors that only DCL is aware of! The more categories you are jumping up, the higher the cost will be. So someone who already had a category V concierge room would have paid much less to upgrade to a category T than we did. Still, at the end of the day, we paid less than those people because we got such a great deal when we originally booked. Let me know if you have any other questions!