Yesterday, Stampin' Up! released a retirement list for the Holiday catalog which is a wonderful thing. Now you can definitively know whether or not something that you've been considering will be available (or not) after the catalog period is over. At this point, none of the retiring products are discounted, but I will venture a guess that there will be some sort of Cyber Monday/Black Friday-ish sale soon. There are many wonderful things on the list, so check it out to see if something you've been considering will be gone forever.
Stampin' Up! has said that the stamps will be guaranteed to be available up until the last week, but all other products are available while supplies last. At this point the only thing that is no longer available is the Witches Hat decor item, but I suspect that more will sell out soon.