The original Sakuma Drops in Tokyo?

I would like to buy the original Sakuma Drops sweets, the kind the children had in The Grave of The Fireflies (Hotaru No Haka).

At Seijo Ishii in Shibuya they had Sakuma's Drops but not Sakuma Drops. I bought a tin of Sakuma's Drops, but I would also like to try the original.

I read the recipe is different and I want to see which ones I like better. And of course, it would be nice to have the exact same kind which appeared in the anime.

Ah, recently I saw tin of Sakuma's Drops,
but it's with a picture of Setsuko, so I lost my appetite...
Here is the image...
http://www.excite.co.jp/News/reviewmov/20131122/E1385049669959.html

I'm unsure but how about "Niki" in Ueno/SkyTree or "Okashi no Machioka"?
Today in Tokyo, there are many shops called "Dagashi-ya" in Japanese sell cheap/old-fashioned candies, I saw them in Ikebukuro or odaiba, maybe they sell it.

By the way, amazon has it.
http://www.amazon.co.jp/gp/product/B0031Y7CF8/

The original package is different.
The museum shop in Roppongi Hills, and the package of photos of Mika Ninagawa
Sakuma drop are sold.
http://www.macmuseumshop.com/products/detail.php?product_id=135

Thank you for the links and tips. I found them at Takeya in Okachimachi. Picture of Setsuko on the tin.

I will keep the links in mind. Thanks!

Just a quick update, as the last response was written three years ago, but this thread has become the first Google result when looking for Sakuma drop directions.

As of July 2017, Takeya in Okachimachi is still selling the lovely Setsuko tin! You get there easily from the Okachimachi JR station or the Naka-okachimachi subway station. The shop is on the first floor in a completely bright purple building, it is really hard to miss. Thanks a lot to rent-a-cat for this really helpful information!

I visited official Studio Ghibli shops in Kyoto and Tokyo first and none of them sell Sakuma drops. So best go straight to Takeya.