I don't buy books from Amazon, so this particular example doesn't apply to me, but in general I buy products where they are the cheapest, if the product is identical. I do not consider it immoral to not needlessly waste my money. My responsibility is to myself and my family, not to the vendor.
I do consider it immoral to sell an e-book at 18 dollars in one place and for 9 dollars in another, though you do have to take regional living costs into account. I would, however, never buy an e-book at 18 dollars in the first place, so if I bought it at nine bucks, that would be a gain of nine dollars for the vendor, not a loss.
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