Have you tried ordering direct from aquatic foods?
Depends on how much you use. Or if you can do a group order.
They also sell frozen and freeze dried n
That would be he safest approach. I tried LFS blackworms some months back and ended up losing fish to bloating and bacterial issues. Blackworms can live in the fridge for a while, but need water changes and they lose nutrition over time. It's really difficult to judge how a LFS handles something like blackworms. I remember getting one portion that smelled horrible when I opened it up at home. Had to pitch it in the trash. Certainly not a universal scenario, but you should know how well your LFS handles them.