There is a decent selection of stones at all times, and if they don't have it, they get it in a timely manner. The store owners are amazing, so if it is not a quick need (if they don't have it that is), the wait it worth supporting amazing people.
I have seen it there before!
The staff is very knowledgeable, i would call and ask first. They also can refer you to shops that sell rocks in the area.
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