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Re:Ask HN: Monetizing newsletter with 2M and 1M members by mcnnowak on Friday August 11, 2017 @03:55PM (#14993529)
Maybe sneak an Amazon Affiliate link to some book that isn't on your site.
Re:Ask HN: Monetizing newsletter with 2M and 1M members by dangelov on Friday August 11, 2017 @03:57PM (#14993557)
As another comment here mentions it[0], it's actually against Amazon's policy, but either way affiliate links in general have not worked that great for us.

[0] https://news.ycombinator.com/item?id=14993332