I love sea bream. We've got a fresh fish van that parks up down the road from me every Friday morning:
https://tinyurl.com/y2p3x8jb
If the guy has got any sea bream left when I get down there, that's usually what I go for.
My best bargain in Sainsbury's was when I bought a £3 ready meal for 50p. However, when I came to cook it, I noticed that there was an error on the packaging. (The instructions for cooking from fresh and cooking from frozen were both labelled 'cook from fresh'). So I sent the packaging to Sainsbury's Customer Services, pointing out that I wasn't complaining about the product itself but just letting them know about a packaging error. They withdrew the product from all their stores until they could get their packaging reprinted and sent me a £10 voucher for letting them know. Not bad for a 50p meal, which I'd really enjoyed anyway ;-)