They usually don't mark things as "no longer available" because people can always cancel orders, it's why there's a waitlist. I wonder if they got a lot of complaints about the shipping cost and made it unavailable until they fix it. Unlikely, but just a thought.
I know this may be an odd thing to say, though can any store charge ANYTHING they want for shipping? Or is it even legal to make up a random price for shipping? A friend told me shipping was $20 for a plain copy of the FF remaster. I didn't believe him, there's no way a physical disc copy that weighs not even 100g costs that much to ship.