You can get them from the companies that provide those welding shops with their oxygen and acetylene. I once looked into it and they wanted $100 deposit for a bottle and then $60 (~) to refill.
I never got around to doing it; not yet.
I would go to PetBox and ask Megumi-san where they get their O2 from; get a number, and then have them provide you a small bottle like for soda dispensers...just make sure it's food grade.
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