Thanks for this I just gave it a read. Sounds like you had quite the experience. I'll be sure to watch my scrapers closely, seems I may need to update them more often than I'd like.
Thanks! The immediate monetization is through affiliate linking to the various book sites that are aggregated. Letting people buy through the site would make for much better UX so that is certainly part of the plan.
The goal of this site is to tell you the cheapest place to buy a book assuming you already know the title. So if you wish to search "Calculus" it's perhaps not the site for you. If you instead search for "Calculus Made Easy" you will get much better results on where to cheaply buy that book.