rokkatei biscuit available at haneda airport?

Hi I am looking to buy rokkatei maruse butter and other products. Wondering if they are sold in haneda airport?
Otherwise where are they available? I will be in Tokyo/Osaka/kyoto.. If its available in any of these 3 places? I'm thinking best chance will be in Tokyo.

On a separate note, anyone can advise if the more popular items like shiroi koibito, Royce, potato farm etc. Are easy to find within haneda airport.. Going to be first time there..no idea how huge the place is.

Thanks in advance!

If you know the day to your trip, it is possible to teach that you are selling anywhere in the department store.
Table of Japanese is here.
Rokkatei
https://www.rokkatei-eshop.com/contents/shop/saiji/
shiroi koibito
http://www.ishiya.co.jp/event/
Royce seems to be in such duty-free corner of Haneda Airport.
http://www.royce.com/contents/english_dfslist/

Hi haro1210, I will be in Osaka 3,4,5 Feb. Kyoto 6,7,8 Feb and Tokyo 9,10,11,12 Feb..

Thanks so much for your advice!

The ishiya (sapporo cookie) is sold in the duty free shop downstairs close to the food court.

You can also get it at the Hokkaido satellite shop in ginza.

Rokkatei
kyoto
Daimaru Kyoto
Takashimaya Kyoto
tokyo
Shinjuku Takashimaya
Shinjuku Keio Department Store
Shibuya Tokyu Department Store
Seibu Shibuya Ikebukuro
Hokkaido dosanko Plaza Yurakucho Ikebukuro
These department stores, and are sold.
However, since it may number is small, it is better you have bought in the early hours.
shiroi koibito is not sold at just the right time.
It is sold in the province of next.
Since in 2013 was sold at Haneda of duty-free shops, perhaps, might have also sold now.
TOKYO SOUVENIR SHOP
http://www.haneda-airport.jp/inter/en/premises/tenant/5200100031300000...

Thanks so much everyone!

Sorry but I have a new question. I saw limited edition Royce chocolate and salted caramel flavour on calbee website
www.calbee.co.JP/potatochips/

Sorry I don't understand Japanese so can anyone please advice if I can buy these at department store? Otherwise where will they be sold? I love salted caramel!

Thanks in advance again!

Calbee +(Plus) are located in Tokyo Station Yaesu underground shopping center, Odaiba diversity, Takeshita Street, Tokyo Solamachi.
http://www.calbee.co.jp/calbeeplus/index.html
http://www.calbee.co.jp/calbeeplus/food/chitose.html

Dealer of potato chips that you have links do not know.
Because it has been released in Japan, it is sold in supermarkets and convenience stores.
However, it is not sure if they sell in any shop.
Potato chips has been topping royce chocolate are sold at Calbee plus.