I ordered them on February 22, unsure if I wanted to actually buy the books, but since the price was just too good, I decided to keep my order.
I have Amazon Prime and my copy of the gift set shipped on June 6.
At the end of April, if I remember correctly, I added a gift certificate to pay for the books and my pre-order discount disappeared. I emailed Amazon and they fixed it by lowering the price of the books.
When the price went down further, the pre-order discount appeared again along with the new price.
From past experiences with Amazon, I know that changing shipping or even looking at the shipping options sometimes messes up your ship date, so I knew better than to mess around with that, even though I was tempted to change it to one-day shipping.
Anyways... my question to those who ordered before me or around the same time (February 22)... did you change your shipping, billing, or any other detail of your order? Perhaps to go from free shipping to standard or to two-day?
I was thinking that maybe they shipped out to Amazon Prime members first, but I read that some of those were even delayed.