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Just tried this link and it still looks like it's discounted: https://gumroad.com/l/the_cyber_plumbers_handbook/hackernews...

Let me know if it's still not working.

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it says that promotion code expired

As stated in the original post, it was only valid for 2 days through May 19. If you're a student, you can still get it for free. Just checkout the website for details https://cph.opsdisk.com

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