700g Heinz Tomato Ketchup for £1 at Poundworld. They had this right next to the 400g they normally sell for £1 and thought it may have been in the wrong section (yes, the sods sell items for more than £1)
Think this size usually retails around £2 in supermarkets
The Best Before Date is 1st May so fairly short dated so I would recommend checking this if you find any.
Apologies for the poor pic. I tried to get the item and receipt in together.