We buy in bulk from Arbor Teas. We go through a lot of tea -- both caf and decaf English Breakfast and Earl Grey, masala chai black, and mango black are our go-tos. We've also bought some herbal teas from them before but we aren't drinking that much herbal tea these days
We also have three of these and love them:
https://www.arborteas.com/stainless-steel-tea-filter.html
And we like their storage tins as well.