I've spent several months during the first part of this year collecting information on what Japanese imports go for abroad and I've created what I think are some halfway respectable price guides. I'd be perfectly happy to let digitpress use this info in anyway you can especially since a lot of systems have almost no info for the import prices.
Here are the guides:
Wonderswan
http://www.risingstuff.com/forums/vi...c.php?f=6&t=40
Saturn
http://www.risingstuff.com/forums/vi...c.php?f=7&t=33
Famicom
http://www.risingstuff.com/forums/vi....php?f=5&t=241
Dreamcast
http://www.risingstuff.com/forums/vi...php?f=35&t=520
3DO
http://www.risingstuff.com/forums/vi....php?f=29&t=15
PC Engine
http://www.risingstuff.com/forums/vi....php?f=8&t=104
I have a few more unreleased ones that I might put up over the course of the rest of the year. If I do, I'll be sure to let you know.