I am no help on acquiring your BNM.

However, I will say that I am amazed at the seasonal species population shifts in my creek. I tend to catch a different array of minnow species from one month to the next. (And I am not yet that efficient at capturing my samples.)

If it is easy for you to keep sampling your creeks, my advice would be to keep trying while you are waiting to find commercial BNM.

Maybe you will get lucky, or maybe you will find a different species that could add some forage diversification to your pond.

Good luck!