Mr Kipling Mince Pies 6pk are on Buy 1 get 1 free in Tesco.
Butter enriched (4%) pastry with a mincemeat filling (48%), baked with a sprinkling of sugar."
Some (most of) boxes aren't dated until Christmas but had a look right to the very back of the shelf and found some, so a decent saving. Although that's banking on someone in the house not eating them before hand.
Even if you can't find any date for later on, then you could freeze them (can you do that?) or just buy them for eating just now! :-)
They are £1.48 each in Asda with no Special Offer.
And they are £1.49 in Sainsburys, but you can buy 2 for £2.50 there.