You can probably get some pretty good prices right now. Try the Bargain Finder and just tell exactly what you want. You'll get several offers, so you can pick the best. We're going in just over a month. Can't wait!
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Linda
Star Princess
Sun Princess
Carnival Inspiration
I would think you will have a range of availability but it will pay off better if you are flexable. I never book more than 60 days ahead my self and I have gone on some excellent bargain trips. If your priority is to go, more than the cruiseline and accomdations, I would book a guarantee.