Many of them are located in very old buildings, passed on from the previous generations, like the store from this photo. And the sellers are sure to make you feel welcome, as only the Japanese can!
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 22mm
Aperture: F/5.6
Shutter Speed: 1/60s
ISO Sensitivity: ISO 400