This is from the Shiki-Gun Nara Jusco, taken last September (when the yen was about 110 to the dollar):

You can see in the lower right corner a locally grown green - sencha - which is about $4.50 for 150 grams. There's a genmai-cha in there also, 150g for a little more than three dollars. Bear in mind most of these are grown locally, and they all have harvest and use-by dates on them, something I almost never see in the States.
Here's a little bit down the aisle:

That's a lot of variety of green tea! The more expensive ones, in the upper right, are gyokuros, about $10.80 for 150g being the most expensive. It doesn't hurt that they are locally transported, meaning no freezing cargo bays over long flights. You can see a green there for less than $3 for 150g! And I'm certain it's a very good tea. Of course, if you look, you can find crazy expensive tea, but it's used for family gifts, for example, and the packaging is very often pricey as well. One of the best greens I ever drank was from a woman selling from a stand outside of Ise, about $5 for 300g - it was great stuff, packed right on her family farm.
Here's one last example. You know those ItoEn 'Teas Tea'? In New York, they range from $1.75 to $2.50 per bottle. Yowza!

There's a small bit of a full aisle of bottled unsweetened tea goodness, less than $1 per bottle. And bear in mind this is just at a Jusco, not a special tea shop.
again, apologies for going off topic. But when I see that New York's ItoEn is mentioned as 'competitive' - well, I have to wonder, competitive to what? Really, the sad truth of it is that in America we are always paying much more than the actual value of green tea. Even mugicha here (in New York) is a minimum of 50 bags for $4 - a good 100% price increase.
Gosh, I didn't mean for this to come off as harsh. I'd love great, reasonably priced tea as the next person (Adagio, honestly, is one of the best vendors in this respect). And I would love - absolutely - a good, real, high quality and inexpensive tea shop in Manhattan. Maybe it's time to start something..?