Tesco Finest Whole Kalamata Olives 290g, normally £2.82, but shown on the shelf at my local for £1.58. However they still scan at £2.82. After a trip to customer services, you can get double the difference back, £2.48. So each jar will work out at £0.34!
For some reason the olives were not in their usual spot , but were over at the end of the wine aisle.