So I found Global Grey, a website with all sorts of eBooks on the occult, history, philosophy, feminism, religion, and more. The website offers the whole collection for twenty pounds. I came across this while I was doing research on Baruch Spinoza. I’ll be writing an article about him soon.
Abe Books is also a great place to get a discount on books if you prefer them in print. They have A LOT of old books that are hard to find.