What is the best upscale supermarket in Tokyo?

I am looking for what people consider to be the best supermarket to find niche artisanal items like Japanese speciality strawberries, upscale soy sauce etc.

Thanks in Advance!

2 comments
  1. You can try National Azabu as a supermarket, for specialty fruit you can try the food basement of Isetan in Shinjuku. Bring your credit card.

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