cdjapan only sells new stuff. after items get old they don't carry them anymore.
I have searched on yahoo japan, and got outbid the last time they were up. by 500 yen no less (I didn't have a gold account yet and had already put in a max bid).
I'm looking for the kaiketsu lion maru dvd-box sets. they're older now (2002 release), thus hard to find. I would prefer them in new condition, if possible (you never know who just has them lying around), but would of course take them in very well taken care of used condition.