Finding rare or out-of-print books online can feel like a treasure hunt, but there are a few places where you might strike gold. Project Gutenberg is a fantastic resource for older works that are in the public domain—they have over 60,000 free eBooks, including many classics that are hard to find elsewhere. For more obscure titles, Open Library lets you borrow digital copies, and sometimes even offers scanned versions of old books.
If you're looking for something specific, Archive.org is a goldmine. It hosts a vast collection of texts, including many rare and forgotten works. Google Books also has a surprising number of full-text free books if you dig deep enough. Lastly, don’t overlook forums like Reddit’s r/books or r/forgottenbookmarks—sometimes fellow book lovers share links or tips on where to find elusive reads. Just remember to check copyright laws to ensure the book is legally available.