I understand that you might be annoyed, My Friend @Lily_Ikidney , especially if your favorite chocolate is not available in the grocery you go to & All The Other Kinds of Chocolate ARE There - & It Isn't Happening For the First Time, as you say. 

It never happened to me - but if it did, I would either just go to another shop & look for it there, or choose some other chocolate I haven't tried yet - & maybe it would turn out to be good as well ! 😋