The supermarket has reduced the price of medium-sized 265g boxes from £3 until the end of November.
The deal will only be available while stocks last so you might want to hurry if you're planning to stock up on the chocolates for Christmas.
It was first spotted by money savers on Hot UK Deals.
One deal hunter commented: "Tooth decay here I come."
You can pick up the deal in stores or online – but it is only available until November 27.
It comes two months after Tesco delighted fans by selling two tubs of Cadbury Heroes, Celebrations, Quality Street and Cadbury Roses for £7.
If you missed that deal, don't worry as there are others around.
This year you can pick up stocking fillers for free and save £72 on Christmas presents if you play your freebie cards right.
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