In the past I have usually tried to buy as many juvies as I can get (afford), but my point then was getting breeding pairs.
If ordering, I'd sometimes buy some from one end of the country, others from another side.
Although that still doesn't assure they aren't related.
But later, also separating out any "not so good looking ones" before allowing any slackers or slightly flawed individuals to breed.
With cichlids it usually takes until they are at least 3" before some flaws are obvious.
My minimum is usually is to get t least 6, but at one of the Chicago Cichlid Assn. conventions, I was able to get 20 Guianacara, and at another cichlid convention a bag of 10 young "belly crawler" pikes..

But not only for weeding out the chaff myself, with cichlids...they often weed themselves out.
With the belly crawlers, they went from 10 to 1 male in a matter of weeks in a 6 foot tank, siblings eating other siblings.
Luckily a friend at the same convention bought a bag of 10, that ended up as 1, a female , that later we combined, both being excellent individuals
I also find getting juvies, is also the most affordable way to get choice individuals.
I ordered a dozen Cribroheros rostratus from COA,

And the end results were quite stellar
