See my earlier post. I think I estimated last year, based on the list price at Yodibashi, that I could walk out with a 10R for $6700. But this is based on my memory; it might have been a little less. And it assumes paying with a Credit Card, which gets you another discount.
You might have trouble using a long term resident of Tokyo who still holds a passport other than a Japanese one, as your purchase agent. My son is such an example; he still has a US Passport, but he doubted he could get the deal as his home address is in Tokyo. (Although he certainly could use our address in the US as his home.) But he is employed in Tokyo as well. I am not sure it will work, but I am not sure it won't, either.
In all of this, I have forgotten to mention the exchange rate. The actual cost will vary up and down with the exchange rate for your particular currency, of course.
You might have trouble using a long term resident of Tokyo who still holds a passport other than a Japanese one, as your purchase agent. My son is such an example; he still has a US Passport, but he doubted he could get the deal as his home address is in Tokyo. (Although he certainly could use our address in the US as his home.) But he is employed in Tokyo as well. I am not sure it will work, but I am not sure it won't, either.
In all of this, I have forgotten to mention the exchange rate. The actual cost will vary up and down with the exchange rate for your particular currency, of course.