This Green Tea is available at Mariages Frères. I am not sure about where to find it in the U.S but I got mine in Paris near Place des Ternes, on the
260 Rue Fbg St Honoré location.
Their store is super cute, it was the only one i was going to. At this link you can read more about the ‘Thé Français” even though the article was written in 2004.
The Humble Tea Leaf 