Was in my local tesco before (Haslingden) when I spotted this deal. They were labelled up on a yellow label, at half price 89p. However on scanning them through self serve they scan at 44p. I thought this was quite a good deal really, seem to get a lot of fish for your money. Can't see it online, may be store specific, thought I would share it, hope it helps someone.
Princes tuna chunks carton in brine 375g only 44p instore at tesco (normally 1.89)