Kino titles, in my experience, don't usually come down too much, but I'm thinking of single-disc titles. They might be different on multi-disc sets.
If I didn't already have the much cheaper Australian site, I might have bitten, but as it is, the only thing I might consider is the (available separately) BD of the theatrical film. The special features (particularly the commentaries) really aren't compelling enough. If they'd managed to get cast commentaries (rather than the fanboys), I might also have been tempted. I have that book written by one of them, so I imagine his commentaries will probably mirror the content of his book.