Certain publishers use what is called "the agency model" (Harper Collins for one) in which they dictate the lowest price the bookseller is permitted to sell at. This means that Amazon, Kobo, Sony etc are not allowed to discount below that price. Any non-agency books can be found at varying prices and may be discounted. You may have seen some articles in the news about this lately... The US government is taking the "agency" publishers to court, as well as Apple (this all started because of an arrangement with Apple)
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