It's sorry that Japan society isn't good for foreigners, but Japanese online shops are fine for me (native Japanese), except annoying newsletters you point out.

It's sorry that Japan society isn't good for foreigners, but Japanese online shops are fine for me (native Japanese), except annoying newsletters you point out. Also cheapest kakaku shops may be nervous about avoiding cc fraud, and 4090 is very expensive and easy to exchange to cash, so it would be worst experience. I've never had received phone calls from shop, but it looks reasonable to verify 300kJPY bought from newcomer.