Some States have listings. Here is the current list for Michigan:
MI Fish Farms (this opens a PDF)
If your state requires registration, then you may be able to get a list online from the gub.
You also have Aquaculture associations which are an asset, and then you have regional Aquaculture like NCRAC...
I know that two from MI advertise here, but they also market pond supplies and equipment.
I've talked to a number of them and all seems cool. I doubt they will offer any stocking advice tho. This should be your educated decision.
Things should go really smooth if you are educated and prepared for the fish delivery.
Walmartians seem to be a growing populous these days
