A few vendors ship salts in those. I would just find someone who works in a lab at a university and ask them to save some used empty ones and then
wash them and reuse them. It will be hard to buy only a few of them new. I often save old chemical bottles in certain sizes, as buying just a few
is tough, and finding the exact one you want for sale is harder. Plus shipping is high as they are mostly air, so they need big boxes.
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