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Re:Show HN: Get a list of your Amazon purchases and see what... by ChristianKletzl on Tuesday July 22, 2014 @01:26PM (#8070274)
There is no ceiling in place (I need to look into why different books show similar results). For the mentioned book, there's a difference between for how much it is offered and for how much it is bought (if someone wants $100, it doesn't mean that anyone is buying it for that price)

Scanning 44 other book-buying sites, only 3 are buying that book and the price is between $0.12 and $3.97

Re:Show HN: Get a list of your Amazon purchases and see what... by donall on Tuesday July 22, 2014 @02:55PM (#8070892)
Makes sense. I didn't realize you had multiple sources, but I'm glad you do!