I'm in the same camp. Also discovered them last year when stuff seemed to go quickly but I know years prior to that from longstanding buyers that a lot of BACs were reduced.
It's a bit of a gamble because you could wait and miss out. I'm not too mad about Harrods because I bought mine with a CC offer that took £20 off. Although obviously if I'd waited I'd have had £45 off.
I'll probably hold my fire more next year but then watch that be the year that everything sells out quickly. 🤔
I love the Harrods calendar now I've got it, the box and everything about it feels like a proper lux treat so I'm just going to try and be zen about it even if the price drops further. Tbh if it goes down as far as £175 as a PP said it has done before I may buy another one for double the skincare.