Tea gets complicated quickly. Unfortunately, there is no such thing as a basic green tea. There is basic crappy bagged dust green tea, but you're saying you don't want to buy that. Start here: https://www.artoftea.com/what-is-tea/what-is-green-tea Then google around for some guides of online sellers, such as this one https://www.seriouseats.com/2015/02/best-tea-where-to-buy.ht... Though to be perfecly honest you can get respectable green tea from the fancy tea shops, or even Wegman's. You can also find decent loose leaf teas in Asian grocery stores, but good luck reading the labels.