The book " 40 Years Ago: China's Shame and Prosperity " is currently not available online or in bookstores. Because this book was published in the 1970s, it has been out of print for a long time. It may be out of stock, so it is difficult to buy or borrow it from existing bookstores or online. If you want to collect this book or try to find second-hand books, you can pay attention to some second-hand bookstores or trading platforms such as Xianyu. However, you need to pay attention to whether the book has been out of print or whether there are copyright issues. You can also try to contact the author or the bookstore to see if anyone can transfer or sell the book. If you are very interested in this book, you can also try to search for related second-hand book trading platforms or online bookstores on the Internet, but you need to choose carefully to ensure the quality and legitimacy of the book.