Japan has these awesome concept of “Antenna Shops” (アンテナショップ):

Antenna shops were first established in Tokyo in the early 1990s as a means for regional governments to promote local goods and products to the capital’s many residents. Antenna shops for Okinawa and Kumamoto were the first to arrive on the scene in 1994, with the current total of prefectural outlets totaling around 54 – with 28 shops dotted about the Ginza/Yurakucho area alone. Some prefectures retain only one location, while a handful of prefectures sell their goods in multiple outlets.

Antenna Shops in Tokyo

To help those seeking out to visit one (or all) of them I’ve made and share a list on Google Maps: