I get 90% of them at a local bookstore called Morawa, as I go there nearly daily;
though there are also several others I visit regularly (the more, the better).
I only rarely order books online as the bookstore is simply faster and I want to hold a book in my hands before I buy it...
But I never, never go to secondhandshops... I hate it when you look at books and see that they have already been read... 😖 and most secondhandshops dont have the books Id like to buy anyways 😬 the only books I'd buy there are old editions of Tolkien-books 🙂