If you see what is a really good price then book. We booked in Jan for a Dec cruise. Price of an inside and get a balcony, 10 nights and a great price (less than 1800 inclusive for the 2 of us). Then last month a 7 night inside under 1000 inclusive for April 2013 for the 2 of us. Again great price. Both cruises are now at regular price with no deals. These cruises are on a new to us ship but have sailed that line before but even if we had not sailed with them before would have gone for it.
Star Princess 2005, Sun Princess 2005
Caribbean Princess 2006, MSC Lirica 2006 , NCL Pearl 2007, Majesty of the Seas 2008, Carnival Destiny 2008, MSC Lirica 2009, Carnival Valor 2009,Carnival Legend 2010, Carnival Liberty 2010,Carnival Fantsay 2011,Carnival Valor Feb 2012, MSC Poesia Dec 2012, MSC Poesia April 2013, Carnival Legend Nov 2013, MSC DIVINA Jan 2014