Although this sounds obvious, also check to make certain that your search criteria (i.e. # of people) is correct. We usually travel with 3 people (me, DH & DD), but sometimes I forget to check and the website defaults to 2 people. There have been a couple of occasions where I checked the price of a cruise we had booked and saw a much lower price. About the time that I was saying "what the heck" and was about to call my TA, I double checked the # of passengers and, sure enough, it was showing 2 instead of 3.