I’m confused

"vSphere High Performance Cookbook" and Back to School Sale

I try to add "vSphere High Performance Cookbook" ebook to basket and use B2S3 code on it, but this not working - ebook still have normal price $32.99. Where can be the problem?

(I tested other Packt Publishing books and this code worked for it, so it's looks like this is problem with this title only and not publisher.)
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