What are the most optimal places to get each kind of Tumblestone?

Question

Regular Tumblestones, Sky Tumblestones, and Black Tumblestones respectively. I want grinding for them to be as short as possible and to not spend money on them

Comments

I was just about to ask this lol 1+

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I am not sure about regular or black, but near the lake in obsidian fieldlands, I have been able to find many sky tumblestones. hope this helps!

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For all Tumblestones, I just go to the Alabaster Icelands and I see deposits everywhere.