For an ebook I wouldn't usually pay more than $3, but I have paid $6 for one because I really wanted to read it but didn't think it was worth the $150 (+ post to UK) the paper version would cost. For real books I don't really have an upper limit because they hold or increase their value and can be cashed in later in life. Ebooks are just disposable entertainment and have no intrinsic value.
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