I haven't bought in a few months. But RioGrande usually has it. I'll check real quick and report back.
Try buying fine casting silver from RioGrande. Never had an issue there.
But people don't want to buy anything but fancy coins.
I'm red, white, and blue.
https://www.riogrande.com/product/.999-fine-silver-casting-grain/100802GP/?code=100802
Looks like they have some. They even have argentium which is nice stuff.