Wouldn't that be the Gift of NC??
Any purchases from the NC Mall from November 29th through January 3rd are tallied and you gain a bonus amount of NC in the new year depending on how much you spend (up to 3,200 bonus NC!).
I am really quite excited about some of the perks in this preview http://www.neopets.com/charitycorner/2019/perk/
Particularly The Hidden Wheel! Looks like collectors might finally have a decent chance at some retired and special stamps without having to spend megabucks