This sounds easy and is very versatile with the fish fillets used. Basically white fish, such as Pangasius, Barramundi, or even Tilapia. You will need fillets, boneless and skinless, so with Barramundi or Tilapia you will need to fillet those.
Four Tilapia would be about 60 Baht, this dish is well under $1 per serving, even with the sides.