Sorry If I'm late on this information, but I thought I'd share it anyway.
For those who are interested, here is the link with a large portion of the GeOnDan albums, including the un-released "GeOnDan RareTrax the LAST".
http://circlege.bandcamp.com/
I spoke to Yuji Takenouchi and he sent me this link. It's a shame that these albums are no longer sold, and aren't even on Youtube, so this Bandcamp page is a real treat. You can purchase the whole thing, or each song individually.