K-On Merch for Those in Japan (as of 3rd June)
I recently visited Akihabara, Nakano, Kyoto and Toyosato in Japan, and here are some merchandises I had found:
Images:
1: K-Book, 3/F Radio Kaikan, Akihabara
Had a dedicated K-on corner, and the richest collection of K-on merch among all stores I had been to.
2&3: Temporary Store, 1/F Radio Kaikan, Akihabara
There was this temporary store next to the main entrance of the building, and it was the only place I found to have the full sets of the newest figures released (Popup Parade and Trio-Try-it Figure)
(For some reason Ritsu's merch is especially cheap...)
4&5: 4/F Tower Records, Shibuya
Also had a dedicated K-on corner, mainly had some albums and the mangas (missing Vol. 2 at the time of my visit).
6: Robot Robot, Nakano Broadway
(I forgot which one, but it was located at the end of a corridor)
Had exactly the 4 gacha keychains shown in the image.
7&8: Toyosatocho Information Center (Toyosato Elementary School)
The store at the School had those hand-decorated cups, some keychains, coasters, and T-shirts with the K-on logo and each of the 5 main characters. K-on stamps were also available (Stamp paper available for 50 yen)
Some other ones I didn't take pictures of:
The Nodoka Figma figure was available at SURUGA-YA Akihabara Main Building. I didn't buy it, so it is likely still there.
The JEUGIA Store in Kyoto had the Singing! towel, some albums and acrylic stands, officially sold by KyoAni.
There were also some K-on acrylic stands and badges available on 4/F of Akihabara Radio Kaikan.
Hope this helps.