If you are missing Christmas and still looking for Festive food or you just really like Mince Pies, it looks like Sainsbury's are selling off what they have left over or maybe they forgot to stop making them in the New Year.
Whatever the reason you can get both the 4 packs of fresh puff pastry or shortbread mince pies for 30p. I don't know if this is national, but I can only assume it would be stock dependent. I picked mine up in the new local at Kings Cross.
PS the photo does only show 3 mince pies, I just got hungry on the tube home.