Soil Sulfur.
It turns out all my adventures in buying sulfur at pharmacies were quite unnecessary: You can buy it by the pound with no questions or funny looks at any garden supply store. It's used as a soil acidifier and pesticide, and can be had as crystals or powder (see next sample for powder form). Of course the purity is not nearly as high as pharmacy sulfur (my bag came with a "guaranteed analysis" of >90% sulfur). But that's good enough for me.
Source: Hardware Store
Contributor: Theodore Gray
Acquired: 16 March, 2003
Price: $2.50
Size: 9"
Purity: >90%
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