It would probably be more financially prudent to set up a savings account and put your money in the savings account and pay Disney just shortly before the due-date of your trip. I'm a big believer in keeping
my money (and earning some sort of interest on it!) until I need to give it to some big corporation (so that they can earn interest on it!).

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I love this idea and I would do it, BUT I'd be more apt to spend it on something else than the Disney vacation. I just know me. Something will come up and I'll say, "oh well, I'll use this and replenish it."
PamNC