If you go to this link: http://www.logos.com/ebooks/new
You'll see the top ~34 books in the list have been just made available for purchase individually, outside of the collections that they were previously only available as a part of. However not all the books in those collections were separated. I'm wondering if these are being made available for the March Madness promotion. (The Treasury of David, anyone?)
I would counsel anyone to wait until next week before making resource purchases. Don't want to jump the gun on some deals that you might get through March Madness.
(I didn't take my own advice, though. I went ahead and picked up Commentaries for Biblical Expositors. I love reading commentary reviews, even when the reviewer's biases are different than mine.)