Uline, the supplier of shipping and warehousing materials, sells several different grades of vermiculite in large quantities for a very reasonable price. There's a distribution center near Allentown, PA, close enough for you to drive and save on shipping costs. It's where I bought the vermiculite for my garden because I needed way more than what the garden centers sell.
Note that you can buy vermiculite and then mix it with cement, or buy premixed vermiculite that already comes with the cement mixed in at the proper ratios. You could contact a manufacturer to ask about a distributor near you.
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