Yes so if you can’t find it anywhere, it’s almost certainly a really cheap niche ebook that can be had for cheap, just stay away from the DRM bookstores and I’m sure you’ll be glad you did.
Though I will say, de-DRMing your ebook is not for the faint of heart. Firstly Claibre doesn’t support it anymore so you have to through some somewhat difficult to trust back channels and yeah it’s a whole thing that I’d rather avoid it altogether.
Though if you find it trivial yourself, you would do us all a great good if you made a step by step guide for your mateys