Some observations on http://www.root1.ac.jp/~cm/1021058/pceparts.htm
I do not know any Japanese, either, but I think that this site looks more
like an appreciation and/or "my collection" site than a sales site (more
like http://www.pcenginefx.com/ than http://www.tzd.com/)
For those of you that have not visited the site yet, there are a number of
photos of some of the more exotic (though not necessarily RARE) PCE
hardware ;-)
I would be very interested to learn more details of what the Japanese site
is all about
Happy gaming