I discovered advent calendars a few years ago, first from John Lewis (£175 and that was about 5 years ago!) followed the next year with Glossybox and LookFantastic. Had no money before Christmas last year, so waited until January and bought several in the sales, Benefit, Perricone and the LookFantastic one, which I then bought again for my sister’s Christmas pressie this year, as I thought it the best AC I’ve had from LF.
But it seems Liberty is the holy grail of advent calendars, and I regard their Beauty Drop as a way of saving up for it.