Hi - my reply isnt about savings, sorry - but you mentioned that you are booked on the destiny - I just cruised the destiny august of this year - it was horrible - we went in the middle of a construction project - constant drilling, machinery everywhere, certain parts of the decks were unavailable because they were stowing the machinery, we were even asked to leave our stateroom for maintenance - thats just some of the crap that went on - if you want to read more, I posted a review under the name Just Me
Just wanted to give you the heads up since no one from Carnival decided to do that for my family...
BTW - another site that gives you great prices is www.lastminutecruises.com - for the future.