You will find kakigōri in coffee shops, out in the street at food stalls or in restaurants. And there's a very simple way to find out if the place sells kakigōri: look for the banner with the kanji 氷, like the one in today's photo...
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 18mm
Aperture: F/5.6
Shutter Speed: 1/30s
ISO Sensitivity: ISO 200