I doubt Sally would have anything. You're more likely to have success at a natural foods/supplements type of store, honestly. Search for it in places with lots of natural/organic/alternative beauty products.
I've had some success early on with Light Mountain brand's red shades. It was like trying to rinse a beach's worth of sand out of my hair (not true of good henna), but it wasn't adulterated with anything worrisome and it did strain fairly well.
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