Actually, I think the BTTF Adv is right where it should be. On the modern stuff, stupidity is The Enforcer and Jaws 2 ($5k+), finally coming to their senses is LA Confidential (still way to high at $1.4k imo), and below what I thought is American Werewolf (only $900), Alien Adv ($800) and ET Adv ($600, although that copy is in terrible shape, so it probably makes sense).
T