These fish are available by millions from the farms and are a dime a dozen, making the most profit for everyone along the supply chain. Nothing can compete with these farm refuse fish anywhere in the world, even less so in South America. There is no financial incentive and neither a market (apart from a few die-hard TSN nerds) to do anything more. Culled TSN obliterate any competition.
In fact, this is probably true for any fish farmed in masses for food, less so for wild restocking, etc.
In theory, and it seems in very rare occasions, different TSN species can make it into the trade as do wild-caught fasciatum. For these, the price is much higher because collecting from the wild costs lots more but this also can be an invitation to even higher "no brainer but against conscience" profit by less honest suppliers. An easy score for them and no accountability - no one really knows or can prove much definitive.
Or anyone can play dumb and point down the supply chain and finally at the collector guys who wallow in the muck anyway, usually simple, poor and uneducated folks.
So to get a w/c TSN one would need to go though a reliable and honest vendor with a reputation to hold up and with a special order and be prepared to pay more than $15 for baby TSN, more like ~$50 and upwards of several hundred $$ for rare species, e.g., corruscans.
wednesday13
could shoot me down, correct, or tell us more on this topic...