The lenses in both cameras and riflescopes are the same technology, and even Nikon makes both cameras and riflescopes. If you're staying at a hotel, I would ask the concierge desk to call a few camera stores to track down one that also sells scopes, or has a connection to a dedicated scope dealer.
This site shows Nikon's Sport Optics division (Nikon Vision Co) is in Tokyo, but it's a big city...
http://www.nikon.com/about/info/group/index.htm
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