For a limited time, Tokyo Disney Resort opens a shop at each of their parks that offers exclusive Disney-designed Japanese souvenirs, as well as apparels and other products. You will find cherry blossom-themed goods, characters in kimonos, Disney Resort-limited Tokyo Bananas, and many more that are not available elsewhere.
The two shops are open from February 1 - 28th, and can be found at the following locations:
Party Gras Gifts
Adventureland
Tokyo Disneyland
https://www.tokyodisneyresort.jp/en/tdl/shop/detail/529/
Nautilus Gifts
Mysterious Island
Tokyo DisneySea
https://www.tokyodisneyresort.jp/en/tds/shop/detail/632/