Hi - I just gave this advice to my sister so I thought I'd share it with you as well. We recently added on points. If you buy directly from Disney, they can line up your use year so they are the same month, which is a huge bonus to figuring out when points are usable. Since we were adding on at another resort, the 11-month window was really important to us. As you may know, when using the 11-month window, your resort points need to be from the same resort. (Once you hit the 7-month, you can go ahead and book using any resort, but that doesn't help with those hard to book places such as the treehouses, AK values, and Riv Tower rooms that are limited.) Rather than pick a set amount of points you THINK you want to add on, I strongly suggest you look at the points charts, pick when you are likely to travel most and for how long, then calculate how many points those particular rooms last. When we went to add on, we picked an amount and then thankfully realized if we did only a few more points we could have the room we wanted for a full week instead of having to bank or borrow a random number of points or worse having those single digit points leftover. You don't have to buy round numbers, so make sure you think about it before pulling the trigger. If you can get to one of the tours, they usually have a nice gift for purchasers too - so it's a bonus if you know what you want to buy and do it onsite. Hope that helps!