I am able to get the expanded shale at one of our local feed stores. It can be used in your soil as well to loosen up tight soil.
I found 6 cu. ft. of coir fiber for 29.99. Shipping is free if shipped to an ace hardware. You can find it at acehardware.com. Still more than peat, but does not inhibit microbial growth as much as peat. Scandinavians used peat moss to preserve fish.
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