Check with your chlorine supplier. Our bulk dealer supplied different sizes. They may sell or at least tell you what their requirements are and where to get them. If that doesn't work Google "15 gal carboy for liquid chlorine". There are lots of suppliers.
Check out your local Craigslist for "15 gallon drum". I got a used food grade drum with snap on/off ring for $5. Otherwise Amazon has a emergency water storage drum for $70.
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