This job is very simple.
Please see Amazon.com and Amazon.jp.
And enter data.
1) Item reserch on Amazon.com.
2) Enter name, price, ASIN, and etc to Excel or spread sheet.
3) See it item on Amazon.jp. Use to ASIN
4) Check to Japan price.
100 items $1.
I'm make research team. It is 5 or 10 peoples.
Please do research with member.