This is a fast and easy method of cooking not only Barramundi but any whitefish, like Pangasius.
In Tesco, Barramundi is sold at about 68 Baht/fish, ocean farmed is normally sold in open markets by the kilo and it is just slightly more than the Tesco fish. One fish will be 2 fillets, cut each fillet in half and there is your 4 pieces. Using Barramundi from Tesco, this is about $1 per serving for 2 servings. Pangasius would be slightly less.