When you come to Nagano you will notice many Soba Restaurants. That is because Soba is a Nagano specialty. You can buy the raw product in omiyage gift stores or in supermarkets. If you are interested in seeing how Soba is made then I suggest you take a trip out of town to Togakushi. This picture is of a traditional Soba Mill at the Ninja Museum in Togakushi. The Soba Noodle is made from ground Buckwheat.
Please see my Togakushi Travelogue for more pictures and information.