I was really lucky and was able to snag a copy of Dungeon Explorer II (sadly no manual but with original case and back art) by trading some CIB GameBoy Advance games and a couple of GameCube wave bird controllers at Frank N Sons collectible show in Southern California a couple of months back.
$200 definitely seems like a fare price for a complete version, but I say stay patient and you'll come across a great deal for it sooner or later