Jacob wrote...
Contact Amazon and find out what's wrong and see if they plan to fulfill the order. They have been taking issue with our books because they are for adults and unfortunately it's on them.
I'm afraid I just followed up on part of Tsujoi's recommendation and cancelled the order. Yesterday I had a conversation with Amazon's help chat about the vanishing page, and the guy told me it's a technical error with the product page; the order was still in process, and as soon as the book would've arrived, they would've fulfilled the order. But now that you're saying they're having issues with your books...
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Well, I just tried reordering it by clicking the "Buy it Again"... and I ended up with this.
Buy it again Clicking the product page link itself still ends up at a 404. Strange stuff.