Where to get good coffee beans

Recently bought a manual coffee grinder from amazon. Levels go from 0-finest to 20-coarse. When I tried grinding at finest; the espresso machine doesn’t even filter. Grinding took about half hour. It was a workout. But after some experiments my espresso machine works at about 9 setting.

I think this grinder made a huge difference to the quality of coffee i am able to make. Some food for thought.
 
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