Straight up: The rarest sencha flavor to find is grassy sencha.
In fact, of every vendor I've ever sampled from, only o-cha has had any grassy flavored sencha.
Indeed, grassy sencha is among my top desire in a sencha.
For example, o-cha has miyabi, Sae Midori, Kirameki and perhaps others that have that wonderful grassy flavor.
But if you try to find a grassy sencha from any other vendor you're SOL.
I felt compelled to bring this up because considering how much I love grassy flavored sencha--you'd think other retailers would also offer some.