I guess tackle shop. BCF or maybe Kmart. I put my in a hard case with original black mints tray hold 100 each. Did a few modification on the box. I have not finish yet. It will be awesome once completed. This sort of original cases cost a fortune. So I got them from the tool shop cost $20 and can hold 200 + capsules with two trays 200 oz capacity when fill up.
That foam they use to put flowers in, it absorbs water to make the flowers lasting longer, you could buy such a block, it's cheap, and push the bars in it anyway you like. Then some plastic film over it to seal it and done.
It might soaked up the Ag then left up some crystal. :lol: Careful when use spongy stuff might have some chlorine base in them ; turn out black ag bar instead. Good idea matey