Youngs Omega 3, Chip Shop, Large Haddock/ Cod Fillets x 4. 500g , £2 a box
You might have problems getting this but at least it ensures there is stock for you. This was not displayed on offer on the freezer but the leaflet does say its on offer. They should have the leaflet in-store, so you can point it out to them if they disagree. Its not online either.