I've been looking for Jade for awhile myself. Just got it for 21 shipped complete, so that seemed fair. Had no idea Studio Ghibli had anything to do with the game, but now that I look at the art, I can see it.
I played Dragon Seeds once back then during the whole Monster Rancher / Pokemon / battle craze...all I remember was something about memory card saves, DNA, and awesome music.
Was it actually any good? Hope so, because this
Training Room music was and still is unbelievably awesome, and about the only thing I remember OST wise.