With paxlovid, I think a lot of people are getting sick right now.  Just a guess.  But this is also a kinda smallish pharmacy inside a grocery store, I have no idea if they have secondary storage elsewhere in the store.  It's possible they just can't keep a huge amount of stock and have to rely on next day delivery.  But I did get it yesterday and just now took my third dose (twice-a-day dosing).