I've updated neo-geo.com's MVS price guide. It was in desperate need of it. I worked with my brother in Japan to try and establish more accurate price quotes. I'm open to any feedback, if you have your own opinions/ideas. This is far from an exact science, and I'm not trying to reinvent the wheel here. It should be much more accurate than it was before, at any rate.
http://www.neo-geo.com/mvs/mvs.html