[Sangetsu]

Your sources are somewhat outdated. Gasoline is not 95 yen per liter, as of today my local station is charging 180 yen per liter. Prices for other items vary greatly according to region. Subtract about 10% for purchases made outside metro Tokyo. Taxi fare is now 710 yen for the first two km. Bus fare is 200 yen on most metro routes.

Prices on other items are generally higher, particularly on imported goods such as European and American clothing. A pair of Puma shoes retailing for $80 in the US will cost about 12k yen in Japan (roughly $120). A $190 pair of 7 For All Mankind jeans will run more than 3 man yen ($300) at Mitsukoshi in Ginza.

As for transporting currency, one million yen is less than ten thousand dollars, so there will be no problems if you need to transport that much money with you when you leave. You must declare amounts over ten thousand dollars, the form is a tax form which takes only moments to fill out.

As for the boom in foreigners living in Japan, non Asians make up perhaps 1/10th of one percent, so the streets aren't exactly teeming with them.