korstmos

Every book has a unique number used to identify them, the ISBN (International Standard Book Number). If you can figure out the ISBN of a book, it becomes an easy search term for piracy, because now you aren’t looking for a long title, you’re looking for a unique number!
Most bookstores will list the ISBN of a book on their website, so that step should be pretty easy.

Then to commit the piracy, you can often just google the ISBN + filetype:pdf and get a free PDF pretty frequently.
There is also library genesis (libgen), where you can look up pirated books via their ISBN, which has a super wide selection.
And if even libgen does not have it, you can try torrent trackers (read up more on !piracy )

Of course most of those options are legally questionable or illegal depending on where you live, and I of course would not recommend you actually perform them ;)

I like how textbooks all have ISBNs
They make pirating them so much easier!

To use variable pricing to get you to pay the most amount possible, or to convince customers that are on the fence with a clever salestalk or small bonuses