First and foremost, we recommend you purchase your Vermiculite or Perlite at your local Masonry and/or Landscape Supply. The price is usually around $15 for a 2 cubic foot bag.
If you are unable to find either product at your local supply, be sure to check with your local plant nurseries as they use both products for plants and potting soil. Simply jump on Google Maps and type PLANT NURSERY and your ZIP CODE in the search bar.
If Plan A and Plan B are a no-go… Plan C always works! Simply click the link below and you can buy Vermiculite directly from Uline.
Before you ask… Both Vermiculite and Perlite are outstanding at insulation and are almost identical in performance so it really doesn’t matter which mineral you use.