Pack of 4 at Tesco £2 https://www.tesco.com/groceries/en-GB/products/254299631
I found the KTC one tasteless not much flavour but gave em a go
I bought 4 for £1 ktc brand from Asda . 4 cases Enough for next 3 months.
Whole Napolina tomatoes are on sale in Morrisons 50p. Personally I think they are overrated but whilst looking at the ingredients the juice is proper tomatoes whereas some of the supermarket brands are concentrated juice.