Cheapest way to get M&S giftcard

If you jumped on the Monese deal, then you would have got Asda or Sainsbury's gift cards for up to 20% off. You can use them in store to purchase M&S gift cards (my local Sainsbury's and Asda sell cards for other retailers). Card Yard doesn't have any available, else that can be another option. If you have an employee discount portal at work, check if they sell discounted gift cards.