In Japan major railway stations have their original meal boxes. In Odawara station, near the ticket barrier of JR Odawara station, there is a station meal box (ekiben) shop which deals with station meal boxes of nearby areas. When I visited Odawara for Odawara Hojo Godai festival on May 3 I bought Sukeroku (vinegared rolled sushi with inarizushi) lunch box for 500 yen. Sukeroku sushi lunch box is actually sold at Tokyo station. They say that they might sell popular station lunch boxes in Japan for special occasion. Under each lunch boxes there are warning for particular allergy sufferers (in Japanese).
What to buy:
Odawara city is near the Harbor so fresh fish is brought in everyday and kamaboko - steamed processed fish meat cleverly formed on a wooden block is one of the main products of Odawara.
Other nationally famous special products of Odawara include pickled plums, paper lanterns and parquetry.