^ just find a local fish store,most will even do custom orders and that way you get ur fish alottttttt cheaper,i custo order most of my fish just because its cheaper and i can get tons of fish my lfs doesnt normally cary,only thing is u have to pick the fish up the day it gets to the petstore
You can buy big fish almost anywhere, but you can only buy certain species from specific people. One of the vendors on here would probably have what you're looking for.