Is there anywhere I can buy canned smoked fish fillets for making fish pie? Despite HK supermarkets having canned every species of sea-life in existence, I've failed to find canned smoked fish (Wellcome, Taste or Gourmet).

I'm not talking about expensive fresh smoked fish either, like this thread:
I just want the cheap canned stuff - like tuna, but smoke flavoured.

Alternatively, I'd love to get hold of some of that smoke flavoured essence. I know that's all that goes into the tinned fish anyway. Anywhere in HK to buy it?