Several ways, ask on here as someone may have one, a local propane dealer may have or can order one, Google it for listing with prices, and last Amazon.
But remember they ate certified for X number of years.
One question do you own a propane grill? If so you can by a adapter hose to hook up your 20lb bottle to your SS grill. One less bottle to fill, and deal with.
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Weber Kettle Club mobile app