Guess it depends what you mean by discount. You can get 1-day PP for $75, 30-day PP bought in advance for $185, 30-day PP bought day-of for $210, or as an AP add-on (if you have an AP) for $99 for the year. So if you don't have an AP and you want it for your entire trip, you'll save $25 if you buy it in advance....... Those are the prices I'm aware of - perhaps others know of a better savings.