I've purchased matcha from a lot of places mostly amazon in the Past. NO LONGER
OCHA & CO has better tea, matcha and prices!! They have better than what is wrongly called "ceremonial grade" but what you REALLY want is the SINGLE CULTIVAR. That's the very best of a tea leaf carefully and professionally created to be a superior Matcha. Glorious in it's umami or flavor, so calming and satisfying it blesses the meditation's fulfillment.
My favorite is the Kyoto Uji then the Single Cultivar Yabukita. You will become a loyal Ocha and Co customer as I have.