Ready Lunchboxes and supermarekt lunch is inexpensive in japan if you are coming from eu, uk or the us. Most supermarkets and grocery stores like AEON, Seven or Seijo selling sell fresh sushi during the day and have special lunch time offers. If you would like to sit down you can check out some of the cheaper sushi places similar to running sushi. If you are looking for dinner or high-end sushi, then you will have to book a reservation ahead of time or you can check out the higher business office building that have premium restaurants at the top floors.
Our favourite authentic Japanese Products on Amazon
* Affiliate Links