We were able to get an upgrade from a verandah to a 1 bedroom on the Magic on January 2nd. We kept checking the availability on the website until it was removed a few days before sailing and could tell they had a lot of concierge rooms available. As stated above, we went to the supervisors desk immediately after checking in, they pulled out a piece of paper with a matrix and looked at the category you had booked, the category you wanted to upgrade to, and it showed the price. While cheaper than had we booked concierge ahead of time, it was still pretty expensive. Was totally worth it though!!!