I just noticed this this morning, so I'm not sure how long it's been up:
Coen Brothers Collection - $19.99
The collection features Blood Simple, Fargo, Miller's Crossing, and Raising Arizona. It's 71% off, so it sounds
like a good deal; fair warning, though--some Amazon reviewers don't like the relatively paltry amount of special features, so you probably shouldn't buy this set on that basis alone.
Here's a Blu-ray.com review
of the set for those interested.