I know what you mean. It took me a while to find the original version of Napoleon Hill's "How to Think and Grow Rich" because everyone and their mother's posted $0.99 versions.

That's why I like Standard Ebooks. It's a website where volunteers transcribe public domain books into high-quality books for various eReaders. A lot of ebooks tends to suffer from poor formatting and grammar issues, but all the books on Standard Ebooks go through a rigorous proofreading process.

The book covers are quite lovely too.

I really like it.

https://standardebooks.org/ebooks/