Criterion is currently not quite halfway through a 24-hour flash sale; all their DVDs and Blu-rays are 50% off for the next 14 hours or so as of this posting (the sale ends at noon EDT on 10-18). It's a great time to go grab anything you missed at the last Barnes & Noble sale.
Hey, my wish list there has over 200 titles on it! Narrowing down from 12 sounds like a piece of cake.
Since this was unexpected (at least to me) but I also know there'll be other sales (both from Criterion itself and from Barnes & Noble), I went with just three this time, all selections I thought would make good Halloween viewing. We try to fill October with seasonally-appropriate movies and shows.