I am looking to buy dvc resale. I figured I would need about 150 points for a week vacation. I want to go every other year so ideally I need 75 points. I see on a resale site someone is selling 60 points which is close but not enough. If I did purchase the 60 points what are my other options to buy the remaining 15 points I need, or should I just wait until something else closer to my need goes up for sale?