Depends.  LD's aren't in demand anymore, and
shipping is generally more expensive than the LD's
themselves.  Also depends on if it's the CAV or
CLV version.  I'm blanking on which one is better,
but you can google that.  If it has the original
obi, and posters (My Mononoke ld set had AWESOME
posters), I'd pay up to $30.