3 for 2 on decorations, trees pretty much
A bit copied and pasted for more info: Choose anything, at any price from any range in our Christmas 3 for 2 and the price of every third item will be deducted from the total.* It’s even better value when you buy 6 or more gifts! Most 3 for 2s work by discounting the value of the cheapest products, so you lose out when you buy multiples of 3. We discount the value of every 3rd product in descending price order. So if you buy 9 gifts, you save on the cost of the 3rd, 6th and 9th most expensive, not the 3 cheapest.
Let me know if I have forgot anything!