Chopped and whole are the same price at Lidl, and I think Sainsburys too, but tinned or carton tomatoes have certainly got more expensive the last few years.
And Tesco's cheap tins are dreadful, so if that's the only supermarket nearby, then I can understand paying more. What you make (eg bolognese) will definitely taste better with nicer tomatoes, however much extra tom purée you add, as I've found out in the past