Not everyone lives near a Menard's, especially in Texas, but there I pay $13.99 for the 2 ft compressed bag that expands to 4 ft. I had the thought today that it probably expands to 4 ft when dry and fluffy, but then contracts quite a bit in size again when it gets wet. So it doesn't exactly double in size.
Menard's also sells vermiculite as insulation, which is less than half the price of what they charge for Burpee's "horticultural" vermiculite. The funny part is that the insulation is made by 'Sun-Gro Horticulture Company.' I've been using it for years.
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