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Buying Your Cast Iron Cauldron
You can buy a cauldron online at Amazon, Etsy, and eBay with cheap or free shipping and with customer reviews before you place an order. You can also find them in new age and occult stores, as well as at outdoor sports stores, like REI or Academy. Cauldrons come in all shapes and sizes, so consider where and how you will use it before you make your purchase.
Choose a cauldron that is 1) made of cast iron and 2) sized for your intended usage. I recommend a small one for your altar and magical purposes, and a larger one for your kitchen or campfire.