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You want to call it a bulk tank. It will need a siphon or dip tube installed inside it.
Common sources are welding supply shops and industrial gas suppliers.
When I priced them last year, it was $50 to rent a 50 pound cylinder for one year. When it was empty, there was a $20 fee and they would come and replace it with a full one...kinda like a propane tank for a grill.
So add the cost of a fill station onto that, another $50 bucks.
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