I booked my May 2013 Dolphin trip last November with the AAA discount, which was better than the nurse's discount. I kept checking back on the prices, and saw a drop around January (maybe?). Changed to that rate, and kept checking. Another price drop maybe a month after that, which I changed to. I kept checking and saw that the prices ticked up a couple of weeks back. The AAA discount was consistently better than the nurse discount during this time.