Interesting! Have you looked into data from Anna (https://annas-archive.li/blog/all-isbns-winners.html)?

Didn’t have the time yet, but it’s on my todo list. I have extractors for Google Books, Hardcover.app, and ISBNDB already working, and Amazon, Goodreads, and Anna’s Archive in the todo list.

I do plan on including a link to the book on Anna’s Archive in the “ISBN Search” website. At least to the search page with the filters already filled.