Through the end of the month, November 30, 2015, Hyatt is running a promotion where you can purchase points with a 30% bonus. While this is not as good as the 40% promotion that they ran over the summer, it can still be beneficial for some. With this promotion you can purchase up to 55,000 points plus the 30% bonus.
While I never recommend purchasing points speculatively, with this promotion there are definitely some opportunities to save money for an upcoming stay. While there are many examples, I do want to point out a few scenarios where purchasing points to redeem can be much cheaper then paying the lowest available rate at the hotel directly: