My Tesco has it, also their frozen tuna steaks are pretty good, as are waitrose's frozen ones. I have just checked and my local waitrose has fresh tuna too.
Why is tinned tuna so expensive these days? It used to be a much cheaper alternative to tinned salmon. A friend of my mother used to add cochineal to hers and pretend it was red salmon. My mother wasn't fooled.
I think its the way its caught now. Its not farmed and netting was catching too many non eaten fish, so its all line caught which puts the price up. More and more fish is also sold fresh or frozen so there is less to can.
Cecil - I tried Tuna steaks a few times but wasn't really keen on the taste and texture. I thought that they tasted more meaty than fishy. Think of all the money I have saved over the years.
My little village fishmonger has some lovely steaks 100 yards up the road
In Manchester, the Arndale fish market -
in Chorlton, "Out of the blue"
In Bolton, the fish market