Thanks for taking the time to read and comment, I'll reply here as well!

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I expected them to be cheaper as well.

However, the cost of storing the books is probably close to nil - Amazon has leagues of servers at their control, I doubt a book that's a couple hundred kbs would create a storage issue.

And, as I found out in my last post, it's actually the publishers who set the prices. They take Amazon's 30% into account, and then some.