You can sign up for Leanpub's email newsletter sales here:
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How Long Do The Discount Offers Last?
Our Weekly newsletter discount offers are valid for six days or so (depending a bit on time zone) from the date of the newsletter.
Our Monthly newsletter discount offers are valid to the end of the month.
Offers in our Author Update newsletter are valid for six days or so as well.
I'm A Leanpub Author. How Can I Opt In To Have My Books, Bundles, and Courses Eligible For The Newsletter Sales?
Here is an article that explains how you can opt in to our newsletter sales: