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I'm often amazed by the frequency sellers underestimate the demand for a book or a record. It's not unusual for them to sell out on the first day.
A few years ago only one of the shops in my town stocked the new Hanson CD. I went at 10am to buy a copy and they had sold out. I went to other shops and was told by each that they hadn't bothered to order any as they didn't believe it would sell.