TRAVELING TO JAPAN! Recommendations for shops for cartridges?

There you go; Yodibashi sells Nagaoka, too.  In fact, I bought an MP500 there in May for about 60% of US price.  Don't know why I forgot Nagaoka in my post above. The bargain price is mostly because of the very favorable exchange rate, yen to dollar, that still prevails, not because of a greedy importer.

Thank you @knotscott @lewm @jeffrey125 for the recommendations!

it is also necessary to evaluate the price ratio in the country of origin/and price in the country of residence.
When years ago I went to the USA for some time I had brought with me a list of cartridges with the costs in my country; arrived in N.Y. I inquired about the costs at a large and well-known shop in the city.
I bought some top-of-the-range Grado for me and some friends and a Krell, the cost was about 7 times lower than in my country, the savings were considerable; it would not have made sense to buy European or Japanese cartridges in the USA.
If you go to Japan, the savings are on Japanese-made cartridges, not imported American or European brands.

Big Camera!!!

But the vast majority of all cartridges are made in Japan or elsewhere in Asia.  In fact, Grado is the only exception I can think of, even assuming Grado cartridges are made in USA, which may not be the case. Along the lines of what you say, best-groove, I notice repeatedly that Japanese re-issues of LPs originally pressed in the USA or Europe are far cheaper in Disc Union than are the original pressings.  This is no bad thing as Japanese pressings are typically superb in quality.  Also, I buy "pre-owned" LPs in Disc Union, without trepidation, because the Japanese appear to take meticulous care of their LPs.  DU uses a rating system of A, B, C, etc. for used LPs.  Any LP rated "A" can be bought sight unseen; it will be like new mint. "B" rated LPs are usually just as good but may have a blemish on the jacket.