Vinnie, I'd shop around
now and book with the best deal you can find for Oct. Especially if you mean
this October.
Since
DCL tends to sail with a full boat (yeah, yeah it's a ship, geez) prices usually don't drop often, especially this close.
My understanding is DreamsUnlimited, sponsors for this here board, do a great job of keep up-to-date on price changes and can get you an adjustment of you book through them.
Good luck.
edit: Darn, Lloyd beat me to it.