I don’t remember what I drink right now, but it’s about $16 for a tiny tin at Sprouts, which is very expensive (Edit: it’s Aiya Ceremonial Grade). I’m planning on ordering some from a supplier who ships directly from Japan soon - likely O-Cha. I’ve had their sencha and it’s fantastic, looking forward to trying their matcha.
As for dose, I measure 1tsp (measuring, not table) per cup. I have one or two cups per day. But I drink it more western style than most would.
I’m trying to wean off my one and only cup of coffee first thing in the morning. Coffee makes me jittery and gives me reflux. Tea makes me alert but calm in the most pleasant and bizarre way, and doesn’t cause me reflux.