TRAVELING TO JAPAN! Recommendations for shops for cartridges?

I preferred the MP-200 over the 500 in my system, either are wonderful cartridges and I am sure they could be acquired for a reasonable sum in Japan vs US. 

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!!!