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I found a book that I wanted, clicked on "Order This Book," and got that message.
Why are books listed for swapping when they are not available?
"The only explanation would be that there was one copy in the system and it was ordered by someone else between the time you accessed the page and when you clicked the order button."
It happened to me after I ordered a book that was the only one in the system. I needed another copy so I did a search for a different edition right after and found one under the same isbn. I ordered it and got that message. It was the book I had just ordered.